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Biomedical subjects

M M Chernin

Publications and source records attributed to M M Chernin.

14 recordsLinked to original sources
PubMed1989

Intraoperative arteriography: comparison of conventional screen-film with photostimulable imaging plate radiographs.

This prospective study compared images obtained with a photostimulable imaging plate with matched images obtained with a conventional screen-film combination in 26 patients undergoing intraoperative arteriography. Diagnostic accuracy of the two techniques was assessed objectively, and image quality was assessed subjectively. In 16 patients (62%), the radiation exposure was reduced by 50% for the imaging plate technique by decreasing the mAs level generally used for the screen-film combination. Because of the dynamic range of the imaging plate system, no repeat examinations were necessary, while 12% of the screen-film studies had to be repeated because of over- or under-penetration. Imaging plate studies required 6% more time for processing than screen-film studies. Receiver-operating-characteristic analysis indicated no difference in diagnostic accuracy between the two imaging techniques. Subjective evaluation also revealed no difference in observer preference for imaging plate or screen-film studies. The imaging plate technique is an excellent alternative to screen-film studies in the operating room.

Angiography↗
PubMed1988

Computed tomography findings in squamous cell carcinoma of the pancreas.

This case illustrates previously unreported computed tomography findings in a primary pancreatic squamous cell carcinoma, an unusual pancreatic malignancy. With bolus injection of intravenous contrast, attenuation of this tumor increased from 35 to 61 Hounsfield units, a finding not typical for pancreatic adenocarcinoma.

Biopsy, Needle↗
PubMed1986

Efficacy of radiologic studies in the detection of Barrett's esophagus.

Esophageal radiography using two different air-contrast techniques was used to examine 30 patients with Barrett's esophagus and 18 controls. All patients had upper gastrointestinal endoscopy and biopsy of the esophagus. The radiographs were randomized, masked, and then interpreted by two radiologists blinded to the endoscopic and biopsy diagnosis. Depending upon the diagnostic strategy of the radiologist, sensitivity varied from 0.36 to 0.83 and specificity from 0.56 to 1.00. A typical receiver-operating-characteristic curve was generated. Esophageal radiography is effective in identifying those patients who have stricture and ulceration as a complication beyond the epithelial transformation. However, because of low sensitivity, it is not a satisfactory method for identifying most cases of Barrett's esophagus.

Adult↗
PubMed1985

Digital subtraction angiography of the pulmonary arteries.

With current high-resolution equipment and proper case selection, intravenous digital subtraction angiography (IVDSA) can consistently demonstrate pulmonary emboli greater than 2.0 mm in size. IVDSA is less traumatic than conventional pulmonary angiography and is preferable for high-risk cases such as patients with pulmonary arterial hypertension. For successful IVDSA studies patients should be able to hold their breath for 10 to 20 seconds. IVDSA should not be used in patients who are extremely dyspneic, who cannot suppress a cough, or who have a low cardiac output. In these instances selective intraarterial DSA is preferable.

Animals↗
PubMed1984

Digital subtraction angiography of the aortic arch.

We evaluated the utility of intravenous digital subtraction angiography (IV DSA) for diagnosing lesions of the aortic arch and great vessels in 25 patients. Digital subtraction angiography (DSA) was found useful in evaluating congenital and acquired lesions of the arch and great vessel origins, and it proved adequate for follow-up of patients who had graft replacement. Cases examined included: right aortic arch, double arch, aortic coarctation, aberrant vascular origins, aortic aneurysm and pseudoaneurysm, changes in atherosclerotic great vessels, and revascularization procedures for patients with pulmonary atresia and aortic interruption. In our experience, DSA is a useful tool for screening and following patients with aortic arch or great vessel lesions; it is often the only diagnostic imaging examination necessary.

Adult↗
PubMed1980

Demonstration of cavitated hepatic masses by "skinny needle" transhepatic cholangiography. The need for ultrasonic or computed tomography evaluation in obstructive jaundice.

A patient with cholestatic jaundice, ascending cholangitis and recent development of sepsis had an unsuspected intrahepatic abscess discovered by "skinny needle" percutaneous transhepatic cholangiography (PTC). Ultrasound and computed tomography (CT) evaluation were omitted in the work-up because of the clinical impression that the disease was almost certainly due to an obstructing calculus. The unsuspected cause of cholestasis was found by PTC but would have more easily been detected by other means, as a second similar case illustrates.

Aged↗
PubMedDate not supplied

Digital subtraction arteriography.

DSA has quickly made the transition from an experimental examination performed in a research institution to a routine procedure performed in a community hospital. Diagnostic quality images for screening applications are obtained in over 90% of patients, and in many instances DSA is the only angiographic study that need be done. The applications of IV DSA have broadened to encompass many angiographic procedures for which selective injections are not mandatory. When IA studies must be performed, digital equipment offers the advantages of speed, safety, and lessened patient discomfort. New technological developments will increase the advantages and applications.

Analog-Digital Conversion↗
PubMedDate not supplied

Epiploic appendicitis: CT characteristics.

Acute infarction of an appendix epiploica resulted in an inflammatory process involving the caudal aspect of the transverse colon and the adjacent greater omentum. Computed tomography demonstrated prominent linear soft tissue densities, an increase in CT number of the involved greater omentum, and posterior displacement of the small bowel. In the setting of acute abdominal pain the location and focal nature of the inflammatory process as seen on CT may allow the radiologist to suggest the correct diagnosis.

Colitis↗
PubMedDate not supplied

Evaluation of double aortic arch and aortic coarctation by intravenous digital subtraction angiography (IV DSA).

Eleven pediatric patients with congenital aortic anomalies were evaluated using intravenous digital subtraction angiography (IV DSA). Excellent correlation was found between IV DSA, other imaging studies, and operative findings. Ten of 11 patients studied (90.9%) were correctly diagnosed using this technique. Intravenous DSA may be the procedure of choice in assessing aortic arch anomalies in selected patients.

Adolescent↗
PubMedDate not supplied

Radiographic disease patterns at the carpus.

Radiographic analysis of the wrist includes evaluation of general nonspecific alterations of the carpus, changes specific to one or several diseases, the location of the abnormalities, and the pattern of disease. Correlation with clinical history is extremely important. Some diseases, such as gout, are usually detectable clinically. Others, such as chondrocalcinosis or chronic infection, may have been unrecognized prior to the radiographic study. Special investigations are necessary in difficult cases.

Arthritis, Rheumatoid↗