Yoshihiro Dodo's research while affiliated with Kurashiki Central Hospital and other places

Publications (41)

Article
Objective: To investigate the ability of source image of time-of-flight magnetic resonance angiography (TOF-MRA) in the detection of fibrous cap rupture of atherosclerotic carotid plaques. Materials and methods: From the database of radiological information in our hospital, 35 patients who underwent carotid MR imaging and subsequent carotid endo...
Article
Full-text available
Purpose To investigate the feasibility of targeted biopsy based on an apparent diffusion coefficient (ADC) map in the detection and localization of prostate cancer. Materials and Methods This study included 288 consecutive patients with high or increasing serum prostate-specific antigen (PSA) levels who underwent prostatic magnetic resonance imagi...
Article
We retrospectively analyzed 16 patients diagnosed with primary thyroid lymphoma from January 1995 to October 2011. Our overall results were satisfactory, with a 92.3% 5-year disease-free survival rate and a 100% 5-year overall survival rate with 52-month median follow up. Patients with localized MALT lymphoma can be effectively treated with radioth...
Article
Full-text available
To investigate the usefulness of targeted biopsy strategy based on apparent diffusion coefficient (ADC) maps in the detection and localization of prostate cancer. Institutional review board approval and informed consent from all participants were obtained. This study included 1448 consecutive patients suspected of having prostate cancer based on PS...
Article
The aim of this study was to evaluate radiotherapy (RT) for localized gastric lymphoma. Patients with MALT lymphoma (stage I E = 12) were treated by 30Gy/20fr with or without rituximab, and patients with DLBCL (stage I E = 17, stage II E = 7) were treated by CHOP or THP-COP with or without rituximab followed by 30Gy/20fr + 10Gy/5fr. Complete respon...
Article
To investigate the feasibility and usefulness of diffusion-weighted magnetic resonance imaging in the detection of testicular torsion. Institutional Review Board approval and informed consent from all participants were obtained. Consecutive 28 patients with acute scrotal symptoms were included in this study. Fat-suppressed T2-weighted, dynamic subt...
Article
The aim of this study was to determine the cutoff level of apparent diffusion coefficient (ADC) values for diagnosing prostate cancer. A total of 45 consecutive patients with prostate cancer who underwent diffusion-weighted magnetic resonance imaging (MRI) with ADC maps before radical prostatectomy were included in this retrospective study. MRI fin...
Article
A 65-year-old man presented with a complaint of dysphasia. PET/CT showed increased FDG uptake in the oral floor, left oropharynx, right hypopharynx, enlarged cervical lymph nodes on the left side, and cervical esophagus. With an endoscopic examination, a simultaneous quintuple cancer was histologically proved, which involved cancers in the oral flo...
Article
Although bronchial and nonbronchial systemic artery embolization (AE) is established procedure for massive life-threatening hemoptysis, no consensus has been reached on the indication of AE for recurrent smaller amount of hemoptysis. We evaluated 35 procedures of AE for hemoptysis performed in our hospital. Most AE were performed for recurrent hemo...
Conference Paper
PURPOSE Mucinous cystic neoplasm of the pancreas has a malignant potential. It is important to accurately diagnose mucinous neoplasm and to differentiate them from other benign cystic lesions. The morphology has been a mainstay for the characterization of cystic lesions of the pancreas. We postulate that ADC map based on diffusion-weighted images c...
Article
To investigate whether the vessel wall MRI of carotid arteries would differentiate at-risk soft plaque from solid fibrous plaque by identifying liquid components more accurately than color Doppler ultrasonography (US). This study included 54 carotid arteries in 54 consecutive patients who underwent carotid endarterectomy. MRI was performed using bl...
Article
To determine whether emergency subtraction dynamic contrast-enhanced MR imaging (DCE-MRI) in combination with T2- and T2*-weighted imaging of the testis is useful in the evaluation of patients with testicular torsion. Fourteen patients with surgically proven testicular torsion were examined using preoperative emergency MRI, including T2-weighted, T...
Article
In patients with acute right-sided epigastric pain, jaundice, and a high fever, it is essential to accurately diagnose the cause of the symptoms, differentiate acute biliary disorders from nonbiliary disorders, and evaluate the severity of the disease. Gray-scale ultrasonography (US) and computed tomography (CT) are useful primary imaging modalitie...
Article
Solid-pseudopapillary tumor (SPT) of the pancreas is characterized as cystic, necrotic, and hemorrhagic degeneration. In this study, magnetic resonance (MR) findings of 4 cases were reviewed. Patchy or spotty areas of high intensity that suggested hemorrhagic degeneration were constantly detected on fat-suppressed T(1)-weighted images. Dynamic cont...
Article
We report a case of polyarteritis nodosa with acute obstructive suppurative cholangitis and biliary hemorrhage. CT and MRI revealed that an aneurysms in the pancreas head caused biliary obstruction. Splanchnic angiography also demonstrated multiple aneurysms of the pancreatic and hepatic arteries. TAE of the aneurysm was successfully performed, but...
Article
To evaluate the clinical outcome of salvage radiotherapy (RT) for biochemical recurrence after radical prostatectomy (RP) at our institution. Between March 1999 and January 2004, 37 patients had salvage RT for prostate-specific antigen (PSA) failure after RP, including eight who had had neoadjuvant hormone therapy. After surgery, PSA was measured w...
Article
It is well known that atherosclerotic plaque of the carotid arteries causes not only luminal stenoses but also cerebral thromboembolism. Black Blood MR imaging of carotid artery can provide important information about vessel wall, especially atherosclerotic plaque. Soft risky plaque composed of lipid core and intraplaque hemorrhage is shown as high...
Article
Although salvage radiation therapy (RT) is a potentially curative treatment option for men with biochemical failure after radical prostatectomy (RP), to our knowledge there are no definitive pretreatment factors predicting patients likely to benefit from this treatment. We examined the impact of volume weighted mean nuclear volume (MNV) of biopsy s...
Article
A case of hepatic myelolipoma was reported. It was very difficult to diagnose hepatic myelolipoma accurately and to distinguish it from hepatocellular carcinoma. A histological study of a specimen obtained by needle biopsy allowed accurate diagnosis.
Article
The characteristic CT findings of internal hernia were obstructive ileus, mass formation, and strangulation of bowel loop and its mesenteric vessels. Careful interpretation of those CT findings in page-view could help to detect mesenteric defect causing strangulation ileus.
Article
To investigate the feasibility of high-resolution selective three-dimensional (3D) magnetic resonance coronary angiography (MRCA) in the evaluation of coronary artery stenoses. In 12 patients with coronary artery stenoses, MRCA of the coronary artery groups, including the coronary segments with stenoses of 50% or greater based on conventional x-ray...
Article
Ultrasonography (US) is the initial imaging modality of choice for evaluation of patients in obstetrics. However, the results of US are not always sufficient. Magnetic resonance (MR) imaging, which uses no ionizing radiation, may be an ideal method for further evaluation. Although MR imaging is not recommended during the first trimester and use of...
Article
The 47-year-old woman underwent abdominal US, CT and MRI, which revealed a hypervascular mass in the lesser sac. The tumor showed low signal intensity on T1-weighted image and high signal intensity on T2-weighted image, which was similar to that seen with the spleen. Angiography demonstrated intense tumor stain supplied by left gastric artery. The...
Article
Scrotal disorders require accurate diagnosis and appropriate treatment for preventing male infertility. It is crucial to differentiate testicular torsion, testicular rupture, and malignant testicular tumor, that require immediate surgical approach from conditions such as acute epididymitis, appendiceal torsion, etc. Dynamic contrast-enhanced subtra...
Article
To evaluate testicular enhancement patterns in various scrotal disorders at dynamic contrast medium-enhanced subtraction magnetic resonance (MR) imaging. Forty-two patients with scrotal symptoms (22 testicular diseases, 20 extratesticular scrotal disorders) underwent three-dimensional (3D) fast field-echo or fast spin-echo dynamic subtraction MR im...
Article
Rapid advances in techniques of magnetic resonance (MR) imaging have enabled diagnosis of acute gynecologic conditions, which are characterized by sudden onset of lower abdominal pain, fever, genital bleeding, intraperitoneal bleeding, or symptoms of shock. The chemical-selective fat-suppression technique not only helps establish the characteristic...
Article
To evaluate the frequency of artifact from arterial pulsatile compression as the cause of pseudo-obstruction of the extrahepatic bile duct at magnetic resonance (MR) cholangiopancreatography (MRCP) and specify the causative vessels. In 234 patients (102 men, 132 women; age range, 25-80 years), MRCP images obtained by using a single-shot turbo spin-...
Article
Rapid advances in techniques of contrast material-enhanced magnetic resonance (MR) angiography have enabled evaluation of the entire aorta and the main arteries. Dynamic subtraction MR angiography consists of first-pass imaging of long segments of arteries by using a three-dimensional fast field echo sequence with multiple rapid bolus injections of...
Article
The effects of endocrine therapy on prostate cancer were assessed by using Gd-dynamic subtraction MRI (DSMRI). The 36 lesions showed early enhancement before therapy were treated with endocrine therapy. The criteria used for the assessment of therapeutic effect was ; the degree of early enhancement could decrease with the viability of cancer reduce...
Article
Three-dimensional (3D) magnetic resonance (MR) portography with contrast material enhancement is a fast means of evaluating the portal venous system that has some advantages over currently used modalities, such as digital subtraction angiography, helical computed tomography, ultrasonography, and nonenhanced MR angiography with time-of-flight and ph...
Article
Magnetic resonance (MR) cholangiopancreatography is a noninvasive imaging technique that has proved accurate in the diagnosis of biliary obstruction. However, various diagnostic pitfalls have been reported with MR cholangiopancreatography that were not encountered previously at conventional biliary imaging. These pitfalls may simulate or mask vario...
Article
In order to obtain high quality of MRCP image, it is important to reduce the background signal intensity and increase the contrast of the pancreatobiliary ducts relative to surrounding fat tissue. The combination of long effective-TE and fat suppression technique including the short-TI inversion recovery and chemical-selective fat suppression enabl...
Article
1. High-resolution MRCP is a noninvasive imaging modality for depicting the pancreatobiliary tree. The imaging quality of high-resolution MRCP is satisfactory. MRCP can demonstrate dilation, stenosis, and intraductal filling defects of both the biliary tract and the pancreatic duct, which meets the clinical demand for pancreatobiliary imaging. 2. M...
Article
The purpose of this study was to determine the MR appearance of struma ovarii correlating with the pathological features. MR findings of two patients with struma ovarii were retrospectively reviewed and compared with the pathological findings. Both tumors were complex masses composed of multiple cysts and solid components. The size and signal inten...
Article
We have developed magnetic resonance dynamic subtraction angiography (MRDSA), which depicts the long segments of arteries from the upper abdomen to the lower leg by using a small dose of Gd-DTPA. The lower half of the body was divided into three imaging regions, abdomen, thigh and lower leg, in the order of scanning. The contrast-enhanced three-dim...
Conference Paper
PURPOSE/AIM To illustrate MR image findings of a normal testis. To describe the characteristic MR findings in testicular torsion. To describe treatment choice and clinical outcome. To illustrate MR findings in testicular torsion mimics. To discuss the role of color-Doppler US and MR imaging of testicular torsion. CONTENT ORGANIZATION A. Anatomy....

Citations

... 6 Testicular radionuclide scintigraphy, MRI, real time sonography, and doppler sonography have been used to increase the accuracy of distinguishing between infection and torsion. 7 High resolution ultrasonography combined with color Doppler study is the imaging modality of choice for distinguishing between infection and torsion. Color Doppler ultrasound demonstrates testicular perfusion which aids in reaching a specific dianosis. ...
... Our study emphasized the importance of histological plaque features in prognosis assessment. Our findings suggest that the size of fibrous cap thickness is a strong predictor of plaque instability [27]. In the analyzed samples, focal inflammation was a constant plaque feature, and previous reports found the macrophages were the main inflammatory cells [28]. ...
... Luczynska E et al. 15 showed that DWI may be helpful in differentiating high-grade tumours from intermediate, lowgrade and decrease in the mean ADC. Almost similar findings were reported by Anwar SS et al. 16 Yuji Watanabe et al. 17 Woodfield CA et al. 6 Out of 38 patients studied, 36 patients had a GS of > 6. The rest of the two patients showed GS less than 6 (One showing 3 + 2, another one showing 2 + 2) and proved non-malignant in the biopsy. ...
... Therefore, this biopsy technique has advantages over in-bore MRI biopsies in terms of time and cost. It has been proven to be a better technique for detecting CSC than non-targeted systematic biopsy [54][55][56][57][58][59][60][61][62]. However, a disadvantage is that the processes of cognitive fusion and visual registration are operatordependent. ...
... In addition, MRI has the ability to image small structures [6] and can be used as both a clinical and a problem-solving tool [7,8]. DWI imaging may add valuable information and is currently being applied when investigating various testicular conditions and diseases, e.g., microlithiasis, torsion, undescended testis and varicocele [1,[9][10][11]. ...
... Kumar et al. reported a mean ADC value of 1.68 ± 0.31 × 10 − 3 mm 2 /s for the PZ compared with 1.07 ± 0.25 × 10 − 3 mm 2 /s obtained for the central gland in healthy volunteers [19]. They also obtained a cutoff value of 1.17 × 10 − 3 mm 2 /s to predict PCa, while Nagayama et al. reported a cutoff value of 1.35 × 10 − 3 mm 2 /s with an accuracy of 93% [19,132]. Further, in PZ PCa, DWI outperformed quantitative T2 and DCE-MRI [133]. ...
... The possibility of vascular complications in the setting of atherosclerosis largely depends on plaque characteristics [7,8]. Further, the consequences of the complications are determined by various histological characteristics of the plaque, which include the severity of vascular narrowing, lipid core, fibrosis, hemorrhage, calcification, and fibrous cap rupture [9]. The most fatal complication of atherosclerotic plaque is its rupture and luminal thrombosis -a common mechanism responsible for ACS and sudden death [10]. ...
... Malignant transformation of an MCT is an uncommon event occurring in less than 2% of all mature dermoid cysts. 17 Malignant transformation starts at the postmenopausal period with an average age of 55 years; the most common malignant transformation occurs to squamous cell carcinoma . 18 Other malignancies include adenocarcinoma, sarcoma, carcinoid, thyroid carcinoma and melanoma. ...
... This lag results in venous contamination of the bolus-chase MRA images of the legs [2][3][4] and reduces their diagnostic utility. A number of strategies such as subtraction techniques [5], venous compression [6,7], alternate contrast bolus injection schemes [8,9], data postprocessing [10,11], and parallel imaging [12,13] have been used to help alleviate venous contamination from leg boluschase MRA images with varying success. Alternatively, distal-station MRA can also be performed using time-resolved contrast-enhanced MRA in which multiple datasets are acquired in quick succession after injection of a contrast bolus. ...
... We can obtain different features of an image like color, texture, shape etc. since we are dealing with the grayscale image for the identification of defects, we shall be dealing with shape extraction so that the problem areas over the edges of the tooth could easily be identified. Shape feature extraction can be classified as contour based and region based [31][32][33][34][35][36][37][38]. Contour based feature extraction identifies features on the boundary of the image while region based technique identifies features on the entire region of the image [17][18][19][20]. ...