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Yedaun Lee,
Jae-Woo Song,
Eun Jin Chae,
Hyun Joo Lee,
Choong-Wook Lee, Kyung-Hyun Do,
Joon Beom Seo,
Mi-Young Kim,
Jin Seong Lee,
Koun-Sik Song,
Tae Sun Shim
The British journal of radiology 02/2013; · 2.11 Impact Factor
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ABSTRACT: To investigate radiation doses in pediatric chest radiography in a national survey and to analyze the factors that affect radiation doses.
The study was based on the results of 149 chest radiography machines in 135 hospitals nationwide. For each machine, a chest radiograph was obtained by using a phantom representing a 5-year-old child (ATOM® dosimetry phantom, model 705-D, CIRS, Norfolk, VA, USA) with each hospital's own protocol. Five glass dosimeters (M-GD352M, Asahi Techno Glass Corporation, Shizuoka, Japan) were horizontally installed at the center of the phantom to measure the dose. Other factors including machine's radiography system, presence of dedicated pediatric radiography machine, presence of an attending pediatric radiologist, and the use of automatic exposure control (AEC) were also evaluated.
The average protocol for pediatric chest radiography examination in Korea was 94.9 peak kilovoltage and 4.30 milliampere second. The mean entrance surface dose (ESD) during a single examination was 140.4 microgray (µGy). The third quartile, median, minimum and maximum value of ESD were 160.8 µGy, 93.4 µGy, 18.8 µGy, and 2334.6 µGy, respectively. There was no significant dose difference between digital and non-digital radiography systems. The use of AEC significantly reduced radiation doses of pediatric chest radiographs (p < 0.001).
Our nationwide survey shows that the third quartile, median, and mean ESD for pediatric chest radiograph is 160.8 µGy, 93.4 µGy, and 140.4 µGy, respectively. No significant dose difference is noticed between digital and non-digital radiography systems, and the use of AEC helps significantly reduce radiation doses.
Korean journal of radiology: official journal of the Korean Radiological Society 09/2012; 13(5):610-7. · 1.32 Impact Factor
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Eun Lee,
Ju-Hee Seo,
Hyoung-Young Kim,
Jinho Yu,
Jin Woo Song,
Young Soo Park,
Se-Jin Jang, Kyung-Hyun Do,
Jiwon Kwon,
Sung-Woo Park,
Jeong-Hwan Park,
Soo-Jong Hong
[show abstract]
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ABSTRACT: Several children presenting with mild symptoms of respiratory tract infection were diagnosed with unclassified interstitial pneumonia with fibrosis. Their clinical and radiological findings were similar to those of acute interstitial pneumonia, but there were some differences in the pathological findings. Unclassified interstitial pneumonia with fibrosis is characterized by histological findings of centrilobular distribution of alveolar damage and bronchiolar destruction with bronchiolar obliteration. This report describes two different series of familial cases of unclassified interstitial pneumonia with fibrosis, which developed almost simultaneously in the spring. Some of the individual cases showed rapidly progressive respiratory failure of unknown cause, with comparable clinical courses and similar radiological and pathological features, including lung fibrosis. Each family member was affected almost simultaneously in the spring, different kinds of viruses were detected in two patients, and all members were negative for bacterial infection, environmental and occupational agents, drugs, and radiation. These findings implicate a viral infection and/or processes related to a viral infection, such as an exaggerated or altered immune response, or an unknown inhaled environmental agent in the pathogenesis of unclassified interstitial pneumonia with fibrosis.
Allergy, asthma & immunology research 07/2012; 4(4):240-4. · 1.91 Impact Factor
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Sang-Ho Choi,
Sang-Bum Hong,
Gwang-Beom Ko,
Yumi Lee,
Hyun Jung Park,
So-Youn Park,
Song Mi Moon,
Oh-Hyun Cho,
Ki-Ho Park,
Yong Pil Chong, [......],
Jin Won Huh,
Heungsup Sung, Kyung-Hyun Do,
Sang-Oh Lee,
Mi-Na Kim,
Jin-Yong Jeong,
Chae-Man Lim,
Yang Soo Kim,
Jun Hee Woo,
Younsuck Koh
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ABSTRACT: The role of viruses in pneumonia in adults and the impact of viral infection on mortality have not been elucidated. Previous studies have significant limitations in that they relied predominantly on upper respiratory specimens.
To investigate the role of viral infection in adult patients with pneumonia requiring intensive care unit (ICU) admission.
A retrospective analysis of a prospective cohort was conducted in a 28-bed medical ICU. Patients with severe community-acquired pneumonia (CAP) or healthcare-associated pneumonia (HCAP) were included in the study.
A total of 198 patients (64 with CAP, 134 with HCAP) were included for analysis. Of these, 115 patients (58.1%) underwent bronchoscopic bronchoalveolar lavage (BAL), 104 of whom were tested for respiratory viruses by BAL fluid reverse-transcription polymerase chain reaction (RT-PCR). Nasopharyngeal specimen RT-PCR was performed in 159 patients (84.1%). Seventy-one patients (35.9%) had a bacterial infection, and 72 patients (36.4%) had a viral infection. Rhinovirus was the most common identified virus (23.6%), followed by parainfluenza virus (20.8%), human metapneumovirus (18.1%), influenza virus (16.7%), and respiratory syncytial virus (13.9%). Respiratory syncytial virus was significantly more common in the CAP group (CAP, 10.9%; HCAP, 2.2%; P = 0.01). The mortalities of patients with bacterial infections, viral infections, and bacterial-viral coinfections were not significantly different (25.5, 26.5, and 33.3%, respectively; P = 0.82).
Viruses are frequently found in the airway of patients with pneumonia requiring ICU admission and may cause severe forms of pneumonia. Patients with viral infection and bacterial infection had comparable mortality rates.
American Journal of Respiratory and Critical Care Medicine 06/2012; 186(4):325-32. · 11.08 Impact Factor
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ABSTRACT: This study aimed to assess the change in findings of nonspecific interstitial pneumonia (NSIP) from high-resolution computed tomography (HRCT) on long-term follow-up (median, 38 months).
A retrospective review of changes in HRCT in 68 patients with NSIP (fibrotic progression, 61) with follow-up HRCT of at least 1-year interval was conducted.
Follow-up HRCT findings showed a decreased extent of ground-glass opacity and consolidation, with increased honeycombing, traction bronchiectasis, and architectural distortion (all P < 0.05). Radiological improvement was seen in 36%, stability was seen in 23%, and fibrotic progression was seen with recurrence in 13% and without recurrence in 28%. In 3 patients (4.9%), HRCT converted to a definite usual interstitial pneumonia pattern. Honeycombing and reticulation were independent predictors for mortality in fibrotic NSIP (P < 0.01).
Although most of the follow-up HRCT scans showed improvement in the extent of ground-glass opacity and consolidation, approximately one third showed fibrotic progression or recurrence, with transition from NSIP to definite usual interstitial pneumonia pattern.
Journal of computer assisted tomography 03/2012; 36(2):170-4. · 1.38 Impact Factor
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Seong Yeon Park,
Chaehun Lim,
Sang-Oh Lee,
Sang-Ho Choi,
Yang Soo Kim,
Jun Hee Woo,
Jae-Woo Song,
Mi Young Kim,
Eun Jin Chae, Kyung-Hyun Do,
Koun-Sik Song,
Joon Beom Seo,
Sung-Han Kim
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ABSTRACT: We evaluated CT findings and their prognostic value in non-neutropenic transplant recipients with invasive pulmonary aspergillosis (IPA) compared with neutropenic patients with IPA.
All adult patients during a 27-month who met the criteria for proven or probable IPA according to the 2008 EORTC/MSG criteria were retrospectively enrolled. Initial CT findings were reviewed by two radiologists blinded to the patients' demographics and clinical outcomes.
A total of 50 non-neutropenic transplant recipients and 60 neutropenic patients were enrolled. Consolidation-or-mass, halo signs, and angio-invasive form were observed less often in non-neutropenic transplant recipients than in neutropenic patients: (56%, 26%, and 32%) versus (78%, 55%, and 60%, p = 0.01, p = 0.002, and p = 0.003, respectively). Multivariate analysis revealed that macronodules (HR 0.31, p = 0.001), multiple infarct-shaped consolidations (HR 4.26, p < 0.001), renal replacement therapy (HR 5.62, p < 0.001) and persistence of a positive serum galactomannan (HR 7.14, p < 0.001) were independently associated with 90-day mortality.
Our data indicate that CT findings in non-neutropenic transplant recipients with IPA are similar to those in neutropenic patients with IPA except that consolidation-or-mass, halo sings, and angio-invasive form are less frequent, and certain CT findings such as macronodules and multiple infarct-shaped consolidations have prognostic implications in IPA.
The Journal of infection 08/2011; 63(6):447-56. · 4.13 Impact Factor
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Jeong Hyun Park,
Yangjin Jegal,
Tae Sun Shim,
Chae-Man Lim,
Sang Do Lee,
Younsuck Koh,
Woo Sung Kim,
Won Dong Kim,
Roland du Bois, Kyung-Hyun Do,
Dong Soon Kim
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ABSTRACT: We performed 24-hr monitoring of pulse oximetric saturation (SpO(2)) with ECG and six-minute walk test (6MWT) in 19 patients with fibrotic interstitial lung diseases (ILD) to investigate; 1) The frequency and severity of hypoxemia and dysrhythmia during daily activities and 6MWT, 2) safety of 6MWT, and 3) the parameters of 6MWT which can replace 24-hr continuous monitoring of SpO(2) to predict hypoxemia during daily activities. All patients experienced waking hour hypoxemia, and eight of nineteen patients spent > 10% of waking hours in hypoxemic state. Most patients experienced frequent arrhythmia, mostly atrial premature contractions (APCs) and ventricular premature contractions (VPCs). There were significant correlation between the variables of 6MWT and hypoxemia during daily activities. All of the patients who desaturated below 80% before 300 meters spent more than 10% of waking hour in hypoxemia (P = 0.018). In contrast to waking hour hypoxemia, SpO(2) did not drop significantly during sleep except in the patients whose daytime resting SpO(2) was already low. In conclusion, patients with fibrotic ILD showed significant period of hypoxemia during daily activities and frequent VPCs and APCs. Six-minute walk test is a useful surrogate marker of waking hour hypoxemia and seems to be safe without continuous monitoring of SpO(2).
Journal of Korean medical science 03/2011; 26(3):372-8. · 0.84 Impact Factor
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ABSTRACT: Interpolation artifact is known to occur when the heart rate is decreased lower than the critical value for the specific pitch. The purpose of our study is to determine the minimum heart rate (minHR) for the specific pitch that provides images without interpolation artifact when using dual-source computed tomography (DSCT). We scanned the 'thin slice thickness block' of the CT performance phantom provided by the American Association of Physicists in Medicine using DSCT for variable pitches. Change in heart rate was simulated through ECG editing by changing R-R interval. Axial, sagittal, and coronal image sets were reconstructed and assessed for the presence and extent of interpolation artifact. MinHR at which no interpolation artifact was detected for each pitch value was determined. Length of interpolation artifact (LOA) on sagittal view was also measured when the heart rate was simulated at 10 bpm lower than the minHR on each pitch setting. MinHRs for each pitch value were 9-10 bpm from the estimated heart rate. However, minHR for the lowest pitch value 0.2, estimated heart value 40 bpm was 37 bpm. LOA was larger in the low heart rate condition. Measured values of minHR were correlated exactly with the calculated values. MinHRs that provide images without interpolation artifact for each pitch value when using DSCT were determined. The concept of minHR is important for obtaining high quality images of cardiac CT angiography when using DSCT.
The international journal of cardiovascular imaging 02/2010; 26 Suppl 1:103-9. · 2.15 Impact Factor
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ABSTRACT: Patients with usual interstitial pneumonia (UIP) associated with collagen vascular disease (CVD) have been reported to have a better prognosis than those with idiopathic pulmonary fibrosis with a UIP pattern (IPF/UIP) seen on histology. The aim of this study was to evaluate the pathologic and radiologic differences between the two conditions and their relationship with clinical outcome.
A retrospective review of 100 patients (CVD-UIP, 39 patients; IPF/UIP, 61 patients) with UIP pattern diagnosed by surgical lung biopsy at one tertiary referral center.
The median follow-up period was 34.4 months. The CVD-UIP group was younger, included more women and nonsmokers, and showed better survival than the IPF/UIP group. Pathologically, CVD-UIP patients had fewer fibroblastic foci and smaller honeycombing (HC) spaces with higher germinal centers and total inflammation scores than IPF/UIP patients. Radiologically, CVD-UIP patients had a lower emphysema score and more likely a nontypical UIP pattern without HC. The germinal centers score was the best distinguishing feature between CVD-UIP and IPF/UIP patients (odds ratio, 2.948; p = 0.001) and was marginally related to survival (p = 0.076). The HC score (hazard ratio [HR], 1.134; p < 0.001), total lung capacity (TLC) [HR, 0.932; p = 0.004], and age (HR, 1.052; p = 0.017) were significant predictors of survival in all patients with UIP histology, regardless of the presence of CVD. Among IPF/UIP patients, those with positive autoantibodies were pathologically more similar to CVD-UIP than to IPF/UIP without autoantibodies, despite no difference in survival between them.
The germinal centers score was the best discriminative between CVD-UIP and IPF/UIP patients; it was of marginal prognostic significance. Age, TLC, and HC score were independent prognostic factors in all patients with UIP histology.
Chest 04/2009; 136(1):23-30. · 5.25 Impact Factor
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Eun Jin Chae, Kyung-Hyun Do,
Joon Beom Seo,
Seong Hoon Park,
Joon-Won Kang,
Yu Mi Jang,
Jin Seong Lee,
Jae-Woo Song,
Koun-Sik Song,
Jeong Hyun Lee,
Ah Young Kim,
Tae-Hwan Lim
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ABSTRACT: Behçet disease is a chronic, relapsing, systemic disorder of unknown etiology, characterized by recurrent oral and genital ulcers, uveitis, and other clinical manifestations in multiple organ systems. Although the diagnosis is made on the basis of the combination of typical clinical symptoms, radiologic findings of Behçet disease show characteristic features of its involvement in the gastrointestinal, neurologic, cardiovascular, and thoracic organ systems. In the gastrointestinal tract, Behçet disease may produce various types of ulcers in the esophagus, stomach, and small and large intestines, as well as deeply penetrating ulcerations in the ileocecal region, with frequently accompanying enteric fistulas. Neurologic involvement includes typical and atypical parenchymal neurobehcet disease, dural sinus thrombosis, cerebral arterial aneurysm, occlusion, dissection, and meningitis. Vascular involvement is divided into three subsets including venous occlusion, arterial occlusion, and arterial aneurysm. Cardiac manifestations include intracardiac thrombus, endomyocardial fibrosis, periaortic pseudoaneurysm, and rupture of the sinus of Valsalva. Manifestations of Behçet disease in the thorax include pulmonary arterial aneurysm, pulmonary arterial thromboembolism, thrombosis in the superior vena cava, pulmonary infarction, hemorrhage, and vasculitis of the pleura and pericardium. These various manifestations of Behçet disease respond to steroid treatment; however, one of the characteristics of Behçet disease is the high rate of complications and recurrence after surgery. Familiarity with its various radiologic and clinical characteristics is essential in making an accurate early diagnosis and for prompt treatment of patients with Behçet disease.
Radiographics 08/2008; 28(5):e31. · 2.85 Impact Factor
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ABSTRACT: Congenital coronary artery anomaly is an uncommon condition. Most of these anomalies are clinically silent without associated myocardial ischemia, but some of those may cause significant myocardial ischemia or infarction. Multidetector computed tomography with electrocardiogram (ECG)-gating has a faster volume coverage and higher spatial and temporal resolution and is a noninvasive and accurate technique that can be used to show these kinds of anomalies. Understanding the computed tomographic findings of various coronary artery anomalies is important for obtaining an accurate diagnosis and for formulating an optimal patient treatment plan.
Seminars in Ultrasound CT and MRI 07/2008; 29(3):182-94. · 1.24 Impact Factor
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Young Kyung Lee,
Joon Beom Seo,
Yu Mi Jang, Kyung Hyun Do,
Song Soo Kim,
Jin Seong Lee,
Koun Sik Song,
Jae Woo Song,
Heon Han,
Sam Soo Kim,
Ji Yeon Lee,
Tae-Hwan Lim
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ABSTRACT: To ascertain the incidence of acute and chronic complications of aortic intramural hematoma (IMH) and to analyze the predictors of the development of each complication.
This retrospective study includes 107 consecutive patients diagnosed with aortic IMH by means of computed tomography (CT) during the period from January 1998 to December 2003 and followed up with serial CT examinations (median follow-up period, 320 days). There were 36 patients with type A and 71 with type B IMH. Initial and follow-up CT scans were reviewed, with special attention given to the development of complications, such as increase in the thickness of IMH, clinical and hemodynamic evolution requiring urgent surgery, and development of aortic dissection and/or aneurysm. If each complication developed within 30 days after the initial episode, we classified it as an acute complication; the others were classified as chronic complications. The time interval between the initial and the subsequent CT examination showing each complication was recorded. To identify the predictors of each complication, we analyzed the demographic and CT findings with regard to the following factors: age, sex, maximum thickness of the hematoma, maximum aortic diameter on initial CT examination, ulcerlike projection (ULP) on initial and follow-up CT examinations, and the degree of atherosclerosis. The Cox proportional hazards regression model with stepwise multivariate analyses was used to determine the significant predictors of each complication.
Sixteen patients had acute complications consisting of aortic dissection (n = 7), aortic aneurysm (n = 6), and acute clinical and hemodynamic evolution requiring operation (n = 3). Three additional patients with aortic dissection (n = 1) and aneurysm (n = 2) underwent emergency surgery. Twenty-three patients with chronic complications had aortic dissection (n = 3), and aortic aneurysm (n = 20). Cox proportional hazards regression model revealed that the maximal diameter of involved aorta is the only significant predictor of the development of acute complications (P = 0.006), whereas the age (P = 0.040), type A IMH (P = 0.015), presence of ULP (P = 0.015), and newly developed ULP as revealed on follow-up CT examination (P = 0.032) were significant predictors of the development of chronic complications. With regard to the aortic dissection in 10 patients (9.3%; type A/B ratio, 5:5; median time interval, 34 days), Cox proportional hazards regression model revealed that the maximal thickness of the hematoma is the only significant predictor (P = 0.018). Twenty-one saccular and 5 fusiform aneurysms (24.3%) developed, as revealed on follow-up CT examinations (median time interval, 180 days). The presence of ULP (P = 0.030), type A (P = 0.038) and the maximal thickness of the hematoma (P = 0.017) were significant predictors for the development of an aneurysm.
The maximum thickness of a hematoma on the initial CT is the significant factor predicting the development of aortic dissection and aortic aneurysm. Patients with type A IMH and ULP, as revealed by initial and short-term follow-up CT examinations, should be carefully followed up with subsequent CT examination to monitor the development of an aortic aneurysm, which is a relatively common chronic complication of IMH.
Journal of Computer Assisted Tomography 04/2007; 31(3):435-40. · 1.22 Impact Factor
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American Journal of Roentgenology 12/2005; 185(5):1245-7. · 2.78 Impact Factor
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ABSTRACT: The objectives of our study were to determine the incidence of filling defects in pulmonary arterial stumps on CT after pneumonectomy and to evaluate their radiologic and clinical significance.
We retrospectively reviewed 401 contrast-enhanced chest CT scans of 147 consecutive patients (male-female ratio, 123:24; mean age, 60 years) who underwent pneumonectomy (right, 60; left, 87) from 1996 to 2002 in our institution. CT findings were analyzed for the presence or absence of a filling defect in the vascular stump and its size, shape, and interval change on follow-up CT. CT findings were also evaluated for the length of the vascular stump and the presence of embolism in the contralateral pulmonary arteries, pneumonia, bronchopleural fistula, and bronchiolitis obliterans with organizing pneumonia. Intrathoracic or stump recurrence was also assessed in patients with lung cancer. The medical records of lung cancer patients were reviewed for the cause of pneumonectomy and stage and cell type of cancer at surgery. Statistical tests were performed to determine the relationship between the filling defect and other radiologic and clinical findings.
A filling defect in the vascular stump was seen on CT scans of 18 patients after pneumonectomy (12%), and all had undergone the surgery for lung cancer. It was more frequently found in the right-sided stump (23.3%) than in the left-sided stump (4.6%) (p = 0.001). The vascular stump was longer in patients with a filling defect (37.2 +/- 6.8 [1 SD] mm) than those without this finding (25.0 +/- 12.5 mm) (p < 0.001). Other radiologic and clinical findings were not significantly related to the presence of the filling defect in the vascular stump.
A filling defect in the pulmonary arterial stump seen on CT after pneumonectomy is thought to be an in situ thrombus caused by stasis of blood flow and is not related to pulmonary embolism, tumor recurrence, or other complications after pneumonectomy.
American Journal of Roentgenology 11/2005; 185(4):985-8. · 2.78 Impact Factor
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Soo-Jin Kang,
Eun Young Lee,
Jae-Kwan Song, Kyung-Hyun Do,
Joon Beom Seo,
Tae-Hwan Lim,
Jong-Min Song,
Duk-Hyun Kang,
Young-Hak Kim,
Cheol Whan Lee,
Myeong-Ki Hong,
Seong-Wook Park,
Seung-Jung Park
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ABSTRACT: We sought to assess the relationship between infarct status and systolic contractile function of papillary muscle (PM) for patients with inferior wall myocardial infarction (MI).
Peak systolic velocity (V) of posteromedial PM, systolic strain (epsilon) of posteromedial PM (epsilonPM), V of adjacent inferior wall, and of adjacent inferior wall (epsilonW) were calculated from color Doppler tissue imaging images obtained at apical views in 25 patients with inferior MI and in 13 healthy control subjects. All 25 patients with MI underwent magnetic resonance imaging to assess the infarct status of PM.
Compared with the control subjects, patients with MI had significantly lower V of adjacent inferior wall (5.0 +/- 0.8 vs 4.4 +/- 1.1 cm/s, P = .049) and V of posteromedial PM (4.9 +/- 0.8 vs 4.0 +/- 1.2 cm/s, P = .005), and less systolic deformation, as demonstrated by epsilonW (-17 +/- 3 vs -6 +/- 5%, P < .001) and epsilonPM (-24 +/- 5 vs -11 +/- 6%, P < .001). There was a weak positive correlation between epsilonW and epsilonPM (r = 0.393, P = .052) for patients with MI. Magnetic resonance imaging showed total infarct of PM in 14 patients (group A), with the remaining 11 revealing either normal perfusion or partial infarct of PM (group B). Although epsilonW was similar in groups A and B (-5 +/- 5% vs -8 +/- 6%, P = .20), epsilonPM was significantly lower in group B (-7 +/- 4% vs -16 +/- 4%, P = .004).
In patients with inferior wall MI, infarct status of the PM is variable and determines its systolic contractile function, which can be quantified by epsilon measurement using Doppler tissue imaging.
Journal of the American Society of Echocardiography: official publication of the American Society of Echocardiography 08/2005; 18(8):815-20. · 2.98 Impact Factor
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Sang Il Choi,
Joon Beom Seo,
Seong Hoon Choi,
Soo-Hyun Lee, Kyung-Hyun Do,
Sung Min Ko,
Jin Seong Lee,
Jae-Woo Song,
Koun-Sik Song,
Kee-Joon Choi,
You-Ho Kim,
Tae-Hwan Lim
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ABSTRACT: The aim of this study was to investigate the variation of the size of pulmonary vein ostia during cardiac cycle using ECG-gated multi-detector row CT (MDCT). Nineteen patients were included in this study. Transaxial images at the level of right inferior pulmonary vein (RIPV) were reconstructed in increments of 5%. The ostial diameter of RIPV was measured, the reconstruction windows showing maximal and minimal diameters were selected. The ostial areas of four pulmonary veins were measured at axial image sets of two selected reconstruction windows. The measurement of RIPV revealed that the maximal diameter (1.50+/-0.32 cm) was generally 35% and the minimal diameter (1.28+/-0.28 cm) was usually at 85%. The measurement of ostial areas showed that the ostia enlarged at the end of ventricular systole when compared with those at the end of ventricular diastole, by the factors of 1.44+/-0.55 for the right superior, 1.25+/-0.23 for the right inferior, 1.45+/-0.81 for the left superior, and 1.31+/-0.26 for the left inferior pulmonary vein (P<0.05). The size of the pulmonary vein ostia is variable during the cardiac cycle and the measurement of the pulmonary veins should always be in the same phase of the cardiac cycle during the follow-up of patients.
European Radiology 07/2005; 15(7):1441-5. · 3.22 Impact Factor
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ABSTRACT: Our objective was to ascertain whether displacement of the aortic knob on chest radiographs could be used as a sign to detect a left paratracheal esophageal mass. Sixty-one consecutive pathologically proven esophageal cancer patients were included in this study according to the following criteria: tumor at the aortic arch level; chest radiographs in the neutral position; no unilateral volume loss in the lung. Sixty-one sex- and age-matched subjects served as the control group. To measure the extent of displacement of the aortic arch, we drew a circle over the aortic knob, fitting more than one-quarter of the circumference on the chest radiograph. The distance between the medial end of the circle and the left margin of the trachea (aortic displacement value, ADV) was measured. The difference of the ADV between the study group and the control group was analyzed using a paired t test. The aortic displacement value was significantly larger in the study group (11.7+/-4.5 mm) than in the control group (5.6+/-2.9 mm). When we applied 10 mm as a threshold level, sensitivity and specificity on detection of esophageal cancer were 78.7 and 78.7%, respectively. Displacement of the aortic knob may be a useful sign to indicate a left paratracheal esophageal mass.
European Radiology 06/2005; 15(5):936-40. · 3.22 Impact Factor
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American Journal of Roentgenology 12/2004; 183(5):1244-6. · 2.78 Impact Factor
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ABSTRACT: To assess the value of four-dimensional ultrasonography (dynamic three-dimensional ultrasonography with the added dimension of time) in ultrasonographically guided biopsy procedures of focal hepatic masses.
Four-dimensional ultrasonographically guided biopsy experiments using a freehand technique were performed in phantoms that simulated human liver tissue and had target material. After the protocol was determined and Institutional Review Board approval was obtained, 12 patients underwent four-dimensional ultrasonographically guided biopsy of focal hepatic masses by informed consent. Planar images using 3 orthogonal planes plus a volume-rendered image were used for real-time guidance during the biopsy procedure.
Four-dimensional ultrasonography improved visualization of biopsy devices in all 12 patients (100%) regardless of minor changes in transducer position during the biopsy procedures. Four-dimensional ultrasonography allowed more intuitive apprehension of the spatial relationship of the needle and the target lesion and thus helped in adjusting the needle to an optimal prefiring position in 8 patients (67%). With regard to procedure time, four-dimensional ultrasonographically guided biopsy was comparable with standard two-dimensional ultrasonographically guided techniques.
Compared with standard two-dimensional ultrasonographically guided biopsy, four-dimensional ultrasonography provides improved visualization of biopsy devices and more perceptible information on the spatial relationship between the biopsy needle and the target lesion.
Journal of ultrasound in medicine: official journal of the American Institute of Ultrasound in Medicine 03/2003; 22(2):215-20. · 1.25 Impact Factor
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So Yeon Kim,
Joon Beom Seo, Kyung-Hyun Do,
Jeong-Nam Heo,
Jin Seong Lee,
Jae-Woo Song,
Yeon Hyeon Choe,
Tae Hoon Kim,
Hwan Seok Yong,
Sang Il Choi,
Koun-Sik Song,
Tae-Hwan Lim
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ABSTRACT: Congenital abnormalities of the coronary arteries are an uncommon but important cause of chest pain and, in some cases of hemodynamically significant abnormalities, sudden cardiac death. For several decades, premorbid diagnosis of coronary artery anomalies has been made with conventional angiography. However, this imaging technique has limitations due to its projectional and invasive nature. The recent development of electrocardiographically (ECG)-gated multi-detector row computed tomography (CT) allows accurate and noninvasive depiction of coronary artery anomalies of origin, course, and termination. Multi-detector row CT is superior to conventional angiography in delineating the ostial origin and proximal path of an anomalous coronary artery. Familiarity with the CT appearances of various coronary artery anomalies and an understanding of the clinical significance of these anomalies are essential in making a correct diagnosis and planning patient treatment.
Radiographics 26(2):317-33; discussion 333-4. · 2.85 Impact Factor
