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Biomedical subjects

B Stallenberg

Publications and source records attributed to B Stallenberg.

At least 19 recordsLinked to original sources
PubMed2002

[The medical imaging and radiology department].

Technological developments arising from research have affected the whole wide spectrum of medical endeavor and have made a very significant impact on clinical practice and especially on imaging sciences. Ultrasonography brought spectacular advances, but CT and MRI became important landmark techniques. A further important development, which greatly increased the involvement of radiologists in direct patient management, was the growth of interventional and therapeutic techniques, called interventional radiology. Some statistics: approximately 155,000 patients per year including 19,000 CT Scans, 10,000 MRI exams, 21,000 ultrasound examinations and 1,000 therapeutic procedures. Some research activities: CT quantification of pulmonary emphysema, respiratory mechanics, MR and CT angiography, antenatal diagnosis of congenital and genetic diseases of the fetus, quantification of portal haemodynamics, MR imaging of bile and pancreatic ducts, morphologic and functional imaging of the brain, radiology of bone trauma, MR characterization in hepatic lesions.

Belgium↗
PubMed2001

Radiographic diagnosis of rotator cuff tear based on the supraspinatus muscle radiodensity.

OBJECTIVE: To evaluate the supraspinatus muscle radiodensity on the outlet view as an indication of a tendon tear. DESIGN AND PATIENTS: Plain radiographs and magnetic resonance imaging (MRI) examinations were obtained on both shoulders of 40 subjects aged 23-70 years, including 13 asymptomatic volunteers and 27 patients. Two readers analyzed the superior contour and the heterogeneity of the supraspinatus muscle radiodensity and compared them with the MRI findings. RESULTS AND CONCLUSION: Significant concordances (P < 0.001) were found between the assessments of the superior contour and the heterogeneity of the muscle radiodensity, respectively, on plain radiographs and MR images. For the diagnosis of a full-thickness tear, the analysis of the superior contour and the heterogeneity of the muscle radiodensity reached an accuracy of 85% and 80% respectively. Stepwise discriminant analyses showed low to moderate benefit of considering the contour and the heterogeneity simultaneously. The inter- and intraobserver agreement ranged from moderate to good. We conclude that on the outlet view, modifications in the superior contour and heterogeneity of the supraspinatus muscle radiodensity suggest a full-thickness tear.

Adult↗
PubMed2001

The anatomical distribution of radiological abnormalities in Kashin-Beck disease in Tibet.

A radiological study of osteoarticular changes in Kashin-Beck Disease (KBD) was undertaken on the appendicular skeleton in 105 patients with KBD, in 31 healthy subjects living in an endemic area and in 30 healthy subjects living in a non-endemic area. The bone age was delayed in all three populations with no significant difference between the three studied Tibetan populations. Radiological changes occur in 56% of patients with KBD, and are usually bilateral. An analysis of the distribution of lesions shows a proximo-distal gradient. The changes are more common in the distal aspect of the limb and the lower limb is involved more commonly than the upper limb. The foot and ankle are involved in 89.5% of cases. The radiological changes and their distribution might be explained by the hypothesis of inhibition of angiogenesis by mycotoxins, exacerbated by chemical and physical environmental factors.

Bone and Bones↗
PubMed2001

The vacuum phenomenon: a CT sign of nonunited fracture.

OBJECTIVE: The purpose of this study was to describe on CT scans the presence of a gas collection within a bone fracture reflecting the vacuum phenomenon as a sign of nonunited fracture. CONCLUSION: A gas collection between fractured bone fragments suggests a nonunited fracture.

Adolescent↗
PubMed1999

[Imaging of cartilage. Current status and prospects].

This work describes the composition, organisation, metabolism, biomechanical and physiologic properties of normal cartilage. The initial involution process, of biochemical nature, preceding by far the morphological changes is described as well as the degenerative, inflammatory and traumatic pathogenesis. The modern cartilage imaging techniques are described with emphasis on MRI.

Cartilage Diseases↗
PubMed1997

Imaging in reflex sympathetic dystrophy.

The diagnosis of reflex sympathetic dystrophy (RSD) relies on clinical evaluation, scintigraphy or MR imaging, and routine radiographs. Because RSD has variable manifestations with a strong psychogenic overlap, it is desirable to have a noninvasive test to determine the presence of RSD to allow for appropriate treatment. MR imaging allows a differential diagnosis between RSD and other bone lesions. It proves to be a reliable technique in showing and characterizing RSD better than radiographic examination and radionuclide study.

Diagnosis, Differential↗
PubMed1996

Does the normal contralateral wrist provide the best reference for X-ray film measurements of the pathologic wrist?

This study compares in normal subjects the variability of wrist x-ray film measurements between the right and left sides with the variability of the distribution of those measurements within the population. Additional purposes were to evaluate possible differences of these measurements according to sex, age, side, and hand dominance. The variability when comparing both sides was found to be statistically less for the carpal height, radiolunate, scapholunate, and capitolunate angles than within the whole group of subjects, and for those measurements, there was a high correlation (r > .88) between the right and left sides. In addition, the carpal height and the carporadial ratios were lower and the capitolunate angle was higher in women than in men. There was also a significant decrease of the scapholunate angle in older individuals. The clinical implication of these findings is that in unilateral wrist diseases, the normal wrist should be used to provide the reference values of the carpal height and of the carpal angles on profile x-ray films. However, for the radial inclination and palmar tilt of the distal radius and for the ulnar variance, the normal side does not provide a better reference than normal values obtained from databases.

Adult↗
PubMed1993

Fracture of the posterior aspect of the lateral tibial plateau: radiographic sign of anterior cruciate ligament tear.

Plain radiographs obtained in 25 patients with acute anterior cruciate ligament (ACL) tears detected with magnetic resonance imaging were retrospectively evaluated to identify associated bone lesions. Fracture of the posterior part of the lateral tibial plateau (LTP) was seen in 11 patients, impacted fracture of the lateral femoral condyle (LFC) in two, lateral tibial rim fracture (Segond fracture) in three, and avulsion fracture of the tibial attachment of the ACL in two. The latter three fractures have been associated with an ACL tear. Conversely, fractures of the posterior part of the LTP have not been associated with ACL tear and are recognizable on plain radiographs. Impaction of the LFC on the LTP and avulsion of the posterior tibial capsular junction may account for the association of the fracture of the LTP with the acute ACL tear. This type of fracture represents the most frequent indirect sign of ACL tear seen on plain radiographs.

Adolescent↗
PubMed1992

Transverse geniculate ligament of the knee: appearance and frequency on plain radiographs.

The aims of the study were to determine the frequency of visualization of the normal transverse geniculate ligament (TGL) of the knee on lateral plain radiographs with magnetic resonance imaging (MRI) as a reference, and to determine features that make this ligament apparent on plain radiographs. 50 consecutive lateral plain radiographs and sagittal T1-weighted images of corresponding knees were evaluated prospectively. A TGL was considered visualized on plain radiographs when an opacity of soft-tissue density was apparent in the posterior part of the Hoffa's fat pad. The TGL was identified in 29 of the 50 (58%) sagittal MR images; a TGL was observed on the lateral plain radiographs of six patients (12%). Correlation with the MR images showed that, when visualized on plain radiographs, the ligament is at least 3 mm thick and completely surrounded by fat. Our study shows that the TGL is a normal variant that can be recognized frequently on lateral plain radiographs of the knee.

Adolescent↗
PubMed1992

Gadolinium-DOTA enhanced MR imaging of prostatic lesions. Preliminary results on 14 cases.

Fourteen patients with prostatic carcinoma, benign prostatic hyperplasia, or chronic granulomatous prostatitis underwent gadolinium-DOTA enhanced magnetic resonance imaging of the prostate. Gadolinium-DOTA was administered intravenously in a dosage of 0.1 mmol/kg body weight. All studies were performed on a superconductive 1.5-T system. As compared to noncontrast T1- and T2-weighted images, Gd-DOTA enhanced T1-weighted images were useful in distinguishing malignant tumor from granulomatous prostatitis in one case, but were uncontributive to the differentiation between carcinoma and benign prostatic hyperplasia.

Contrast Media↗
PubMed1991

Renal duplications: the impact of perinatal ultrasound on diagnosis and management.

Perinatal urology is a rapidly expanding field in pediatric urology bringing significant changes in the diagnosis and management of congenital uropathies. Renal duplication was detected by antenatal and perinatal ultrasound in 19 cases (22 duplicated systems). In most cases, no precise diagnosis could be established in utero (4 of 13), but this lack of accuracy is of little clinical significance since all newborns with suspected uropathies undergo complete urological investigations in the perinatal period. Voiding cystogram demonstrated reflux in 11 of 22 cases. On postnatal urography a functioning upper pole was demonstrated in 11 of 22 kidneys. There were 12 ureteroceles: in 8 a nonfunctioning upper pole was removed, while 3 were endoscopically incised with good functional improvement and 1 was reimplanted. Early recognition of congenital uropathies in association with duplication by prenatal ultrasound significantly improves patient care allowing early postnatal relief of obstruction by less invasive methods and before infection or persistent obstruction worsens the prognosis.

Congenital Abnormalities↗
PubMed1990

Magnetic resonance imaging of the normal prostate at 1.5 T.

Prostatic magnetic resonance images of 22 male volunteers less than 30 years old and with no known genito-urinary tract disease were obtained at 1.5 T. Normal anatomical features of the prostate were studied with spin-echo techniques. Different zones of the normal gland are shown by T2-weighted images: the anterior fibromuscular fascia, the central prostate, the peripheral prostate and the periurethral zone can be differentiated. The normal prostate gland is shown on T1-weighted images as a homogeneous appearance. It is important to recognize the normal zonal anatomy of the prostate since prostatic disorders arise in different anatomical zones.

Adult↗