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Hugo Javier Imhof

Hugo Javier Imhof
Hospital J B Iturraspe · Cirugía Endoscopia

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506
Publications
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8,218
Citations

Publications

Publications (506)
Research
Full-text available
Resumen Ejecutivo OBJETIVOS: El tamizaje del cáncer de colon (CC) es una estrategia costo-efectiva. Un grupo de expertos y metodólogos abordó preguntas clínicas para adaptar las recomendaciones y brindar orientación a los proveedores de atención médica involucrados en la atención continua de las personas con riesgo promedio de desarrollar CC. El gr...
Article
Acute necrotizing esophagitis, also known as black esophagus, represents an extremely rare clinical entity, defined by the black pigmentation of the esophagus, secondary to necrosis of the mucosa and detected at endoscopy. We present a clinical case of this rare disease, with its manifestation, diagnosis, treatment, and we perform a review of the l...
Article
Objective: To investigate the feasibility, precision and usefulness of computer aided surgery in ENT-sinus surgery. Material and Methods: 5 Patients with chronic sinus pathology and an indication for sinus surgery were elected. For intraoperative navigation we used a Philips „NEUROGUIDE” system and surgical instruments with LED’s. Navigation proced...
Article
Die MRT ist die beste verfügbare Untersuchungsmethode zur Darstellung des normalen und geschädigten Gelenkknorpels. Sie gibt nicht nur Aufschluss über die Morphologie des geschädigten Areals, sondern auch über die biochemische Zusammensetzung des Gelenkknorpels. Neue Bildverarbeitungstechniken wie die dreidimensionale Erfassung/Darstellung der Knor...
Article
To assess the imaging findings in Chachapoyan mummies of Peru through multidetector computed tomography (MDCT). Twelve human mummies and three burial objects from Laguna de los Cóndores, Peru, about 500-1000 years old, were studied, using a MDCT unit. In addition to the standard whole-body acquisitions, high-resolution scans from areas of particula...
Article
Degenerative osteoarthritis of the hip joint (coxarthrosis) is the most common disease of the hip joint in adults. The diagnosis is based on a combination of radiographic findings and characteristic clinical symptoms. The lack of a radiographic consensus definition has seemingly resulted in a variation of the published incidences and prevalence of...
Article
Cutaneous invasion by direct infiltration and metastasis, in malignant head and neck tumors, has a distinct impact on therapeutic options, especially surgical procedures, curative intent, and overall prognosis. Therefore, the purpose of this study was to determine the diagnostic accuracy of MDCT in detecting cutaneous invasion by malignant head and...
Article
Full-text available
The aim of this study was to determine the accuracy of crown diameter measurements by dental CT as a tool for preoperative diagnosis before tooth transplantations. Fifty-eight patients underwent clinically indicated dental CT. The diameter of the crowns were measured by CT using a standard protocol (1.5-mm slice thickness, 1-mm table feed, 120 kV,...
Chapter
A 68-year-old woman with postmenopausal osteoporosis (menopause 21 years ago).
Article
This ethics committee-approved pilot study was performed with informed consent. A Web-based service that was developed for automated measurement of joint space and automatic analysis of radiographs was tested prospectively. A total of 160 metacarpophalangeal joint spaces were measured in 20 patients (average age, 48 years; age range, 18-89 years; 1...
Article
Diffusion weighted imaging gained attention as an imaging modality, which provides information on the microstructure of a tissue, which can be used for tissue characterization. This is of importance in patients where other diagnostic tools provide equivocal or unspecific information. In addition quantitative diffusion measurements provide objective...
Article
To demonstrate the value of multi detector computed tomography (MDCT) and magnetic resonance imaging (MRI) in the preoperative work up of temporal bone tumors and to present, especially, CT and MR image fusion for surgical planning and performance in computer assisted navigated neurosurgery of temporal bone tumors. Fifteen patients with temporal bo...
Article
To compare the quality of cervical spine MR images obtained by parallel imaging [generalized autocalibrating partially parallel acquisition (GRAPPA)] with those of non-accelerated imaging, we conducted both phantom studies and examinations of ten volunteers at 1.5Tesla with a dedicated 12-element coil system and a head-spine-neck coil combination....
Article
Full-text available
Because the cranial capacity of LB1 (Homo floresiensis) is only 417 cm³, some workers propose that it represents a microcephalic Homo sapiens rather than a new species. This hypothesis is difficult to assess, however, without a clear understanding of how brain shape of microcephalics compares with that of normal humans. We compare three-dimensional...
Chapter
In the European Union, there are over 130,000 victims of severe spinal injuries each year; about 15,000 involve the cervical spine. It has been shown that 23-57% of spinal fractures are missed by standard radiography compared to multi-detector (multi-slice) CT, and there are already many advocates who stress that in severe spinal trauma MDCT should...
Conference Paper
PURPOSE To assess the PIP alterations in rheumatoid arthritis of the finger using a high-resolution microscopy coil at 3 Tesla MRI. METHOD AND MATERIALS High-resolution 3 Tesla MRI of the finger was performed in 17 patients with symptomatic rheumatoid arthritis , using a microimaging gradient insert with gradients up to 200 mT/m. Coronal STIR (TR/...
Article
The clinical potential of multidetector CT is significantly increased because of the possibility of almost instantaneous isotropic reformations in all planes, increased speed and coverage, and easy interpretation. Multidetector CT has a significant role in the correct and quick diagnosis and treatment of emergency department patients. In complex an...
Article
Assessment of bone healing in orthopedic patients is usually monitored by radiographs in two views. The purpose of our study was to compare multiplanar reconstructions from MDCT data sets with digital radiographs for assessing the extent of bone healing. Forty-three orthopedic patients (19 women, 24 men) who underwent MDCT and radiography after art...
Article
Joints represent up to 40% of all MR examinations, which make them, after examinations of the brain and spine, the third most frequent. Almost all of the different joint diseases are found (in different frequencies) in each joint. In this chapter, joint diseases are discussed only with reference to where they are found with the highest frequency. B...
Article
Die Magnetresonanztomographie (MRT) der Hüfte kommt in der Diagnostik bei vielen klinischen Zustandsbildern zum Einsatz. Dies geschieht einerseits mit der konventionellen MRT (ohne Kontrastierung des Gelenkraums) und anderseits mit der MR-Arthrographie. Mit der konventionellen MRT werden Hüftkopfödem und Osteonekrose, differenzialdiagnostisch die a...
Article
The purpose was to assess axial alignment of the lower limb using mechanical axis measurements on conventional and digital radiographs. Total-leg radiographs of 24 patients, 8 male and 16 female, with a mean age of 68.6+/-10.2 years, were performed in a standardized anterior-posterior projection and standing position using a conventional and digita...
Article
Full-text available
White matter hyperintensities (WMHs) on T(2)-weighted magnetic resonance imaging (MRI) of the brain are associated with advanced age and late-life depression. Most investigations predominantly found these lesions in frontal lobe and basal ganglia supporting the hypothesis of a fronto-striatal dysfunction in depression. A prospective study was under...
Article
To evaluate the role of projectional radiography in the detection of primary and potentially malignant bone neoplasms. We retrospectively reviewed the images and medical records of 80 patients (42 male, 38 female; range: 6 to 73 years; mean: 33 years) with pathologically proven primary or indeterminate bone tumors. The most common symptom was local...
Article
Purpose: To evaluate the role of projectional radiography in the detection of primary and potentially malignant bone neoplasms. Materials and methods: We retrospectively reviewed the images and medical records of 80 patients (42 male, 38 female; range: 6 to 73 years; mean: 33 years) with pathologically proven primary or indeterminate bone tumors...
Chapter
In the European Union, there are over 130,000 victims of spinal injuries each year. In the majority of cases, initial radiography is performed in community hospitals and, therefore, in the majority of cases radiography remains the basis on which the initial evaluation of a spinal injury is made. It has been shown that 46% of spinal injuries are mis...
Article
To evaluate articular cartilage repair tissue after biological cartilage repair, we propose a new technique of non-invasive, high-resolution magnetic resonance imaging (MRI) and define a new classification system. For the definition of pertinent variables the repair tissue of 45 patients treated with three different techniques for cartilage repair...
Conference Paper
PURPOSE To investigate the value of pulse inversion harmonic imaging after i.v. administration of a second generation ultrasound contrast agent (�Sonovue) in the differentiation of scintigraphically cold thyroid nodules. METHOD AND MATERIALS 37 patients referred for preoperative ultrasound scanning had pulse inversion harmonic imaging with a 4-7 M...
Article
Palatal implants (PI) have been introduced for orthodontic treatment of dental and skeletal dysgnathia. Due to the restricted amount of bone in this region, precise preoperative anatomic information is necessary. The aim of this study was to determine whether dental CT could serve as a tool to locate the optimal size and position for orthodontic im...
Article
The aim of our study was to evaluate the diagnostic agreement of quantitative sonography of the radius and proximal phalanx and dual-energy X-ray absorptiometry (DXA) of the radius, lumbar spine, and femoral neck for the detection of osteoporosis. In 95 women (mean age, 53 +/- 13 years) and 26 men (mean age, 53 +/- 13 years), DXA measurements of th...
Article
Shoulder instability is a common clinical feature leading to recurrent pain and limited range of motion within the glenohumeral joint. Instability can be due a single traumatic event, general joint laxity or repeated episodes of microtrauma. Differentiation between traumatic and atraumatic forms of shoulder instability requires careful history and...
Article
Shoulder instability is a common clinical feature leading to recurrent pain and limitated range of motion within the glenohumeral joint. Instability can be due a single traumatic event, general joint laxity or repeated episodes of microtrauma. Differentiation between traumatic and atraumatic forms of shoulder instability requires careful history an...
Article
Full-text available
The efficacy of DMARD therapy in rheumatoid arthritis (RA) can be judged by radiological analysis. This study aimed to determine the time-dependent progression of joint damage, acute-phase response, and rates of radiologic progression in early DMARD-treated RA patients over 10 years. We evaluated outpatient records, and radiographs of hands and fee...
Article
In childhood, tumors and tumor-like lesions of the neck are rare and tend to be benign. Very common are congenital cystic lesions (thyroglossal duct cysts, branchial cysts, dermoid cysts, lymphangiomas, cystic hygromas). Common neoplastic lesions are hemangiomas and papillomas. The most common malignant tumors in the head and neck region are lympho...
Chapter
Tumorous lesions of the temporal bone excluding tumors of the cerebellopontine angle (CPA) are relatively rare. The publications of these lesions are mostly in the form of case reports.
Article
Recent studies in the USA and Europe state that computed tomography (CT) scans compromise only 3-5% of all radiological exams, but they contribute 35-45% of total radiation dose to the patient population. These studies lead to concern by several public authorities. Basis of CT-dose measurements is the computed tomography dose index (CTDI), which wa...
Article
Implementation of flat-panel detectors and digital integration of the technique instead of the use of conventional radiographs leads to a shortening of the work process. With flat-panel technology the image production process is shortened by more than 30%. Major advantages in the implementation of integrated RIS, PACS and flat-panel detector system...
Article
Full-text available
Due to the introduction of new therapeutic regimen aimed at increasing and maintaining bone mass, bone densitometry in children has gained interest. As in all new fields of medicine we expect the interest in bone densitometry in children to increase in the coming years. Children pose a unique problem for those involved in the field of bone densitom...
Article
The purpose of our study was to evaluate the diagnostic agreement between imaging-guided and non-imaging-guided quantitative sonography of the calcaneus and dual X-ray absorptiometry of the spine and femur to show osteoporosis. In 113 patients (73 women, 59 +/- 14 years old; 40 men, 48 +/- 16 years old), dual X-ray absorptiometry of the lumbar spin...
Article
Implementation of flat-panel detectors and digital integration of the technique instead of the use of conventional radiographs leads to a shortening of the work process.With flat-panel technology the image production process is shortened by more than 30%. Major advantages in the implementation of integrated RIS,PACS and flat-panel detector system a...
Article
The normal anatomy of the temporal bone and the inner ear will be described in detail on high resolution computed tomography (HRCT) and magnetic resonance images. The imaging technique of computer tomography--either single detector or multi detector CT--is normally obtained in an axial plane without the intravenous application of contrast material....
Article
CT and MRI of acquired abnormalities of the inner ear and cerebello-pontine angle present themselves with very typical findings. The imaging should be adapted to the pathology looked for and either CT or MRI should be used alone or in combination. CT, especially high resolution CT (HRCT), provides an excellent bone contrast, while MRI has a much su...
Article
Tumours lesions of the temporal bone and of the cerebello-pontine angle are rare. This tumours can be separated into benign and malignant lesions. In this paper the CT and MRI characteristics of tumours of the temporal bone and the cerebello-pontane angle will be demonstrated. High resolution CT (HRCT) as usually performed in the axial plane are us...
Article
Congenital abnormalities of the temporal bone are mostly accompanied by conductive or sensori-neural hearing loss. Before any therapeutic procedures are done high resolution CT (HRCT) and magnetic resonance imaging (MRI) should be performed to establish the correct diagnosis and to plan the potentially surgical intervention. HRCT best depicts osseo...
Article
Multi-slice CT (MDCT) is rapidly becoming the new standard in radiological imaging. Although its advantages in cardiovascular, thoracic and abdominal imaging are evident, the extent of its usefulness for imaging the head and neck has yet to be clarified. Because of the shorter examination time motion artifacts are reduced, phonation-studies are pos...
Article
Objective: To describe and compare imaging findings of 3D magnetic resonance imaging (3D MRI) and high resolution computed tomography (HRCT) in children with sensorineural hearing loss. Materials and methods: Sixty-two children (mean age, 8.1±5.47 years) with clinical signs of sensorineural hearing loss underwent 3D MRI and HRCT of the inner ear an...
Article
Based on the Varioscope, a commercially available head-mounted operating binocular, we have developed the Varioscope AR, a see through head-mounted display (HMD) for augmented reality visualization that seamlessly fits into the infrastructure of a surgical navigation system. We have assessed the extent to which stereoscopic visualization improves t...
Article
In addition to conventional imaging methods, dental CT has become an established method for anatomic imaging of the jaws prior to dental implant placement. More recently, this high-resolution imaging technique has gained importance in diagnosing dental-associated diseases of the mandible and maxilla. Since most radiologists have had little experien...
Article
Bei erworbenen Veränderungen des Innenohrs und der Kleinhirnbrückenwinkelregion zeigen CT und MRT typische Bildcharakteristika, wobei die Bildgebung der zu suchenden Veränderung angepasst werden sollte. Die CT liefert hochauflösend (HRCT) einen exzellenten Knochen-, die MRT einen hervorragenden Weichteilkontrast.Akute entzündliche Veränderungen sin...
Article
The normal anatomy of the temporal bone and the inner ear will be described in detail on high resolution computed tomography (HRCT) and magnetic resonance images.The imaging technique of computer tomography – either single detector or multi detector CT – is normally obtained in an axial plane without the intravenous application of contrast material...
Article
Congenital abnormalities of the temporal bone are mostly accompanied by conductive or sensori-neural hearing loss.Before any therapeutic procedures are done high resolution CT (HRCT) and magnetic resonance imaging (MRI) should be performed to establish the correct diagnosis and to plan the potentially surgical intervention.HRCT best depicts osseous...
Article
We developed a head-mounted display (HMD) with integrated computer-generated stereoscopic projection of target structures and integrated it into visit, a specific oral implant planning and navigation software. The HMD is equipped with two miniature computer monitors that project computer-generated graphics stereoscopically into the optical path. It...
Article
The authors evaluated the apparent diffusion coefficient (ADC) in the assessment of vertebral metastases and acute vertebral compression fractures in 22 patients with known or suspected vertebral metastases. On the basis of significantly (P <.03) different ADCs, vertebral metastases (0.69 x 10(-3) mm2/sec) and pathologic compression fractures (0.65...
Chapter
Gelenke stellen mit 20–25% aller MR-Untersuchungen die dritthäufigste Indikation nach Gehirn und Wirbelsäule dar. Gelenkerkrankungen können in unterschiedlicher Häufigkeit in jedem Gelenk auftreten. Im Folgenden werden in jedem Gelenk nur die dort am häufigsten auftretenden Gelenkerkrankungen behandelt. Die Basis-MR-Symptome sind allerdings grundsä...
Article
With the introduction of fat-suppressed gradient-echo and fast spin-echo (FSE) sequences in clinical routine MR visualization of the hyaline articular cartilage is routinely possible in the larger joints. While 3D gradient-echo with fat suppression allows exact depiction of the thickness and surface of cartilage, FSE outlines the normal and abnorma...
Article
Osteoarthritis of the hip joint is a very common disease. There is a minor prevalence of males. By etiology one can distinguish primary (idiopathic) from secondary osteoarthritis. Secondary are due to well-known etiologies as overweight, repetitive traumata, malposture, muscle- and tendon-imbalance etc. Osteoarthritis includes not only cartilage ab...
Article
Full-text available
Hip arthroplasty has become a common and still increasing procedure for the treatment of osteoarthritis, advanced head necrosis, post-inflammatory arthritis or rheumatoid arthritis. Radiography is the most important imaging modality for monitoring the normal, asymptomatic hip arthroplasty. Radiographs are obtained at the end of a surgical treatment...
Article
Variable pathologies are subsumed under the term "synovial disease", including common pathologies such as rheumatoid arthritis. While formerly radiologists had to rely on conventional radiographs and bone scintigraphy with their inherent problems in visualizing soft tissue, noninvasive imaging of the synovium has recently improved substantially wit...
Article
Severe (high-energy) spinal injuries are common sequelae of acute traumas. The task of radiology is to establish the radiological diagnosis, classify it, judge stability and instability and lead further radiological evaluation in cases of non-agreement between the radiological diagnosis and the clinical (neurological) findings. While skeletal abnor...
Article
Implementation of radiological information systems (RIS) and picture archiving and communicating systems (PACS) results in significant changes of workflow in a radiological department. Additional connection with flat-panel detectors leads to a shortening of the work process. RIS and PACS implementation alone reduces the complete workflow by 21-80%....
Article
Severe (high-energy) spinal injuries are common sequelae of acute traumas. The task of radiology is to establish the radiological diagnosis, classify it, judge stability and instability and lead further radiological evaluation in cases of non-agreement between the radiological diagnosis and the clinical (neurological) findings. While skeletal abnor...
Article
Full-text available
Die Implantation einer Hüftgelenkprothese ist eine immer häufiger verwendete medizinische Maßnahme bei Erkrankungen des Hüftgelenks wie Koxarthrose, Hüftkopfnekrose, postentzündliche Arthrose oder rheumatoide Arthritis. Von den bildgebenden Methoden ist das konventionelle Röntgen die wichtigste Untersuchung, um den normalen Behandlungsverlauf eine...

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