摘要:

The authors report a case in which a radionuclide hepatobiliary image was falsely indicative of cystic duct obstruction in a patient with an Indwelling cholecystostomy tube and an externalized gallbladder-duodenal stent. Cystic duct patency was demonstrated radiographlcally shortiy before and after the radlonuclide study. The authors recommend that cystic duct obstruction indicated by a radionuclide hepaloblliary image be confirmed by another means if a cholecystostomy tube is present, or If the patient recently has undergone percutaneous gallbladder or cystic duct manipulations.

ISSN:0363-9762    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

Six diabetic patents with roentgenographic finding of osteomyelits, osteoarthropathy, or both, had combined leukocyte and bone imaging. Bone images demonstrated increased activity in all cases, including three without osteomyelilis. Leukocyte images, however, showed increased activity in only the three cases of osteomyelitis. There was minimal or no activity in the other three cases where osteoarthropathy was ultimately belleved to be the basis of the roentgenographic and bone imaging changes.

ISSN:0363-9762    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

Myositis ossificans progresslva most commonly effects adolescents and young adults. It is characterized by progressive calcification of muscle and frequently follows trauma. Bone imaging may be helpful In determining the full extent of the disease process and may be more accurate than conventional radiographs. Bone Imaging is able to detect lesions before they can be observed with radiographs. In addition, radiographs may tend to underestimate the severity of the disease.

ISSN:0363-9762    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

Four sequential Tc-99m pyrophosphate (PYP) Imaging studies were performed in a 28-year-old man with high fever and exudate pharyngitis associated with renal failure. Radiotracer localization in the left ventricle (LV), lungs, kidneys, and skeletal muscles were seen in two, initial imaging studies. In the second and third imaging studies, area of increase in activity was seen in the left-sided bowel. In studies done two months later (in the third study), the radioactivity in the skeletal muscles was no longer seen. Studies obtained nine months (in the fourth study) after the first imaging showed less radio-tracer localization in the LV, lungs, and kidneys as compared to that seen in the Initial study. Myocardial necrosis and microcalcification were proved by LV biopsy. The exact mechanism of extraosseous bone-imaging agent localization is unknown. However, this phenomenon may be related to renal failure, rhabdomyolysis, hypercal-cemla, hyperphosphatemia, or elevated parathyroid hormone. The Tc-99m PYP imaging study is useful and sensitive in the detection of extraosseous tissue calcification and monitoring of the disease process.

ISSN:0363-9762    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

Correlative imaging by dual-isotope thailium/lechnetium subtraction scintigraphy, computed tomography, and magnetic resonance imaging demonstrated a pathologically proven parathyroid adenoma in a 62-year-old man with known neurofibromatosis, who presented with hypercalcemia and an elevated parathormone level. The association between neurofibromatosis and primary hyperparathyroldism is discussed.

ISSN:0363-9762    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

Muitiple thyroid carcinomas of divergent cellular origin are extremely rare. A case is presented in which two unrelated tumors, a medullary carcinoma and a papiliary carcinoma, occurred as a collision tumor.

ISSN:0363-9762    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

Parameters of systolic and diastolic function obtained from radionuclide ventriculography (RNV) were evaluated in nine cardiac allograft recipients. In 25 examinations, left end-diastolic volume (LEDV), cardiac output (CO), left ejection fraction (LEF), right ejection fraction (REF), heart rate (HR), peak filling rate (PFR), time to peak filling rate (TPFR), peak ejection rate (PER), and average filling rate for the first half of diastole (DFRH) were determined. Endomyocardial blopsy was obtained within 48 hours. Biopsies were divided into three treatment classes (0 = normal; 1 = rejection but not requiring supplemental therapy; and 2 = rejection requiring supplemental immunotherapy). Two independent variables of diastolic function proved to be significant (DFRH P > 0.00001, and PFR P > 0.002) predictors of the dependent variable class when regression analysis was applied to the data. Alterations in diastolic function associated with acute rejection are detectable on RNV and simulate changes anticipated in a primary restrictive cardiomyopathy.

ISSN:0363-9762    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

Two cases of liver cirrhosis associated with marked hypoxemia are presented. Chest radiographs and cardiopulmonary function showed no abnormalities, except for the low diffusion capacity of carbon monoxide and slight elevation of the shunt ratio (20 and 6.2%, respectively), as estimated under conditions of 100% oxygen inhalation. Pulmonary perfusion imaging with Tc-99m macroaggregated albumin (MAA) revealed a significant radioisotope uptake in the lungs, brain, spleen, and both kidneys. Shunt ratios, estimated by the quantitative radionuclide method, were 60 and 68%, respectively. Dynamic pulmonary perfusion imaging revealed a gradual reduction in uptake in all areas of both lungs. The discrepancy of the shunt ratio between the two methods results from an abnormal dilatation of alveolar capillaries. The gradual reduction of radioactivity In areas of the lungs is caused by the passage of MAA particles through widened pulmonary capillaries.

ISSN:0363-9762    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

In a prospective study, 42 consecutive patients with clinically suspected pulmonary embolism underwent ventilation-perfuston (V-Q) lung Imaging and digital subtraction anglography (DSA) concurrently with selective conventional pulmonary anglography (CPA). Thirty-eight studies achieved within 24 hours were reviewed independently by two pairs of observers. The findings were compared using CPA as the gold standard. V-Q lung Imaging had a high percentage of indeterminate results, but none were false negative nor false positive. DSA had a lower percentage of indeterminate results but missed four of the 25 positive cases and erroneously affirmed the presence of pulmonary embolism In three cases. Therefore, the authors think that V-Q lung imaging should remain the screening examination of choice for evaluating patients with suspected pulmonary embollsm.

ISSN:0363-9762    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

A major drawback of in-111-labeled monoclonal antibodies (MoAb) Is the presence of Intense liver, renal, and bone marrow nonspecific activity. This makes the display of the Images hardly optimal and their visual interpretation difficult. In this study, the “intrinsic color scale” (which consists of selecting the limits of the color scale as the highest and the lowest pixel value of the image) was compared to a new, simple algorithm for the determination of the limits of the color scale. This algorithm was based on the count density in the Illac crest areas. OC-125 or anti-CEA in-111 MoAb F(ab‘)2fragments were used in 32 patients with suspected recurrence of ovarian (19 patients) or colorectal cancer (13 patients). Final diagnosis was assessed by surgery (21 patients), biopsy (five patients), or followup (six patients). A 10-minute abdomino-pelvic anterior view was recorded two days after injection. These views are displayed using the two methods and interpreted by two observers. Using their responses in each quadrant of the pelvis, the authors calculated two ROC curves. The comparison of the ROC curves showed better performances for the new method. For example, for the same specificity (73%), the sensitivity of the new method was significantly better (78% versus 68%). This result confirmed the importance of a good methodology for displaying immunoscintigraphic images.

ISSN:0363-9762    

出版商:OVID    

年代:1989

数据来源: OVID