Dennis L. Janzen

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PURPOSE To assess the reproducibility and accuracy of volumetric quantifications of articular cartilage in the knee determined with three-dimensional (3D) magnetic resonance (MR) imaging combined with pulsed saturation transfer subtraction (STS) or T1-weighted fat suppression (FS) imaging. MATERIALS AND METHODS Eight osteoarthritic knees were imaged(More)
A wide variety of cystic lesions may be encountered in the soft tissues and bones during routine MR imaging of the knee. These lesions represent encapsulated fluid collections and exhibit low signal intensity on T1-weighted images and high signal intensity on T2-weighted images because of their high content of free water. Many lesions produce clinical(More)
PURPOSE To assess the magnetic resonance (MR) imaging appearance of the successfully repaired rotator cuff in an asymptomatic population. MATERIALS AND METHODS Fifteen subjects who had undergone clinically successful rotator cuff repair were included in the study. All underwent functional testing of the affected shoulder and had good to excellent scores(More)
Eleven cases of bilateral diffuse microlithiasis of the testes were evaluated sonographically. The presence of testicular microlithiasis was coincidental to the presence of testicular neoplasms (n = 2), nontesticular malignant lesion in the abdomen or chest (n = 2), subfertility (n = 2), varicocele (n = 1), epididymitis (n = 1), testicular maldescent (n =(More)
OBJECTIVE To determine the diagnostic accuracy of helical computed tomography (CT) in the detection of blunt bowel and mesenteric injury in a clinical setting. MATERIALS AND METHODS We evaluated the helical CT and surgical findings in 31 patients with blunt abdominal trauma. Nineteen patients had surgically proven bowel and/or mesenteric injury, and 12(More)
Artifact arising from metal hardware remains a significant problem in orthopedic magnetic resonance imaging. The metal artifact reduction sequence (MARS) reduces the size and intensity of susceptibility artifacts from magnetic field distortion. The sequence, which is based on view angle tilting in combination with increased gradient strength, can be(More)
PURPOSE To determine the relationship between labral cysts and labral tears and glenohumeral instability. MATERIALS AND METHODS Magnetic resonance (MR), clinical, and arthroscopic examinations of the shoulder and the surgical findings of 20 patients were correlated and retrospectively analyzed. A cystic-appearing mass adjacent to the labrum was the(More)
OBJECTIVE To define the clinical, ultrasonographic and magnetic resonance imaging (MRI) findings in patients with painful snapping of the hip secondary to transient subluxation of the iliopsoas tendon. PATIENTS AND METHODS Seven patients, ranging in age from 17 to 30 years, with a total of eight painful snapping hips were examined with static and dynamic(More)
PURPOSE Our goal was to determine the sensitivity and specificity of various CT signs of blunt bowel and mesenteric injury. METHOD The CT findings of 31 patients with blunt abdominal trauma were retrospectively assessed by three observers in consensus. All patients had laparotomy within 24 h of CT. The study group consisted of 19 patients with surgically(More)