Regional alterations in lung ventilation in end-stage primary pulmonary hypertension: correlation between CT and scintigraphy.

Objective: The purpose of this study was to correlate scintigraphic findings of regional alterations in lung ventilation and perfusion with regional variations in CT attenuation in patients with primary pulmonary hypertension.

Subjects And Methods: Chest CT scans and ventilation-perfusion scans obtained within 24 hr of each other in 18 patients with primary pulmonary hypertension referred for lung transplantation were reviewed. The lungs were divided into eight regions (left/right, superior/inferior relative to the carina, and anterior/posterior relative to the trachea).

Resting Tl-201 scintigraphy in the evaluation of coronary artery disease in children with Hurler syndrome.

Severe coronary artery disease may occur early in the course of mucopolysaccharidosis. The authors present radiologic, scintigraphic, and pathologic findings in five patients with Hurler syndrome. Thallium-201 myocardial scintigraphy and selective coronary angiography obtained within 2 days to 6 months were correlated in five patients.

Role of radiology in medical education: perspective of nonradiologists.

Rationale And Objectives: We asked our nonradiologist colleagues to evaluate and comment on the most desirable format for radiology education.

Methods: Questionnaires were distributed to 631 nonradiologist physicians affiliated with the University of Minnesota and representing all medical specialties and academic ranks. Three hundred twenty-seven surveys were returned after one mailing.

A comparison of single blood sample and multiple blood sample methods to measure GFR in a pediatric population.

Several single-sample, Cr-51 EDTA based methods of estimating glomerular filtration rate in children have been proposed. The authors retrospectively reviewed our experience in 467 pediatric patients using Tc-99m DTPA and 4 ultrafiltered serum samples drawn 2-4 hours postinjection. The authors used the 2-hour specimens for the single-sample method.

Postoperative diuresis renography and ultrasound in patients undergoing pyeloplasty. Predictors of surgical outcome.

The authors reviewed 50 pediatric patients (56 renal units) who underwent pyeloplasty and had serial preoperative and postoperative diuresis renogram and ultrasound studies. Of those patients that clinically improved with surgery, 73% and 91% showed improved renographic patterns in postoperative studies at 3 and 12 months, respectively. Ultrasound demonstrated more gradual improvement in grade and pelvic diameters over longer study intervals.

Local reactions to radioiodine in the treatment of thyroid cancer.

Purpose: To compare the rate of local complications resulting from radioiodine ablation of thyroid cancer in patients with a residual intact thyroid lobe to that in patients who had more extensive surgical treatment prior to radioiodine administration.

Patients And Methods: We retrospectively studied 59 patients who had received 131I between 1979 and 1989. The patients were divided into two groups, depending on the extent of their previous surgical thyroid excision.

Pancreas transplants: evaluation using perfusion scintigraphy.

To determine the value of scintigraphic perfusion studies in evaluating pancreas transplant patients, we reviewed 56 of these studies in 22 patients who had 27 transplants. Seventeen patients underwent two or more studies. The perfusion studies were performed with 20 mCi (740 MBq) of 99mTc-DTPA injected as a bolus followed by eight to 16 serial 2-sec images and a 500,000-count immediate static image.

The significance of poor renal transplant concentrating ability as assessed by I-131 Hippuran imaging.

A pattern of very poor renal allograft concentration of I-131 Hippuran and good bladder activity has been observed by the authors. The kidneys are typically barely visualized and the renogram curve is flat. The significance of this particular finding has not been described in the literature.

Nonfunctional photomultiplier tubes can produce subtle total-body scan defects.

Nonfunctional photomultiplier tubes produce subtle total body scan defects. The resultant scan shows bands of reduced activity which are far less obvious than those seen on a standard image.

Improved prediction of thyroid lobar mass from parameters obtained by routine thyroid scintigraphy.

Estimation of thyroid mass both from parameters derived from thyroid scintigraphy and clinical palpation for purposes of therapeutic dosimetry has not been tested for accuracy. To more precisely determine thyroid mass 90 thyroid lobes from 45 autopsies without history of thyroid disease were studied. Specimens were dissected free of nonthyroidal tissue and assessed for volume, maximum depth (D), width (W), length (L) and mass (M).

Exercise-induced muscle uptake of technetium-99m MDP.

Intense muscle localization of Tc-99m MDP to upper extremity musculature was noted three days following weight lifting exercises. This phenomenon is due to an unknown mechanism although several causative factors have been suggested.