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Biomedical subjects

F D Rollo

Publications and source records attributed to F D Rollo.

10 recordsLinked to original sources
PubMed1988

Falsification of clinical credentials by physicians applying for ambulatory-staff privileges.

As part of a quality-assurance program, we reviewed the clinical credentials listed on applications from 773 physicians applying for clinical positions in the Humana MedFirst national ambulatory care program between March 1 and December 31, 1986. In 39 applications (5.0 percent), physicians presented false clinical credentials: 27 physicians (3.5 percent) gave false information about their residency, 10 (1.3 percent) falsely reported board certification, and 2 (0.3 percent) provided false information about both residency and board certification. There was no significant difference between the falsification rates among graduates of U.S. medical schools and those among graduates of foreign medical schools, or among those in the various medical specialties. Falsification was more common among physicians recruited locally than among those recruited nationally, and was significantly more common among applicants who graduated before 1970. Because of this sample included only applicants for ambulatory privileges within a single organization, the findings may be of uncertain generalizability to groups of physicians applying for other classes of privileges in other institutions. We conclude that in applying for some clinical privileges, physicians present inaccurate clinical credentials more frequently than might be expected.

Certification↗
PubMed1978

Performance evaluations of recent wide field scintillation gamma cameras.

Performance characteristics of four recent wide field scintillation gamma cameras were evaluated for 140-keV gamma imaging. Parameters measured included intrinsic spatial resolution, energy resolution, uniformity and linearity distortion, and count-rate capability and its influence on the spatial resolution. The system performance of the cameras was compared with representative parallel-channel collimators in terms of spatial resolution and relative sensitivity. Visual imaging comparisons of each camera system were performed by taking images of Rollo phantom containing four different lesion sizes, with four different contrast ratios, for equal imaging time.

Evaluation Studies as Topic↗
PubMed1978

Sequential myocardial scintigraphy with technetium-99m stannous pyrophosphate following myocardial infarction.

Studies have shown that technetium-99m stannous pyrophosphate (Tc-PPi) is effective for the detection and imaging of acute myocardial infarction. Positive Tc-PPi myocardial scintigrams, however, have been reported in patients with other forms of heart disease and no evidence of recent myocardial infarction. To help define the usefulness of this test, we undertook a prospective study to ascertain when Tc-PPi myocardial scintigrams return to normal after myocardial infarction. Twenty patients with acute myocardial infarction were followed with Tc-PPi scintigrams at 1 and 2 wk, and 1, after infarction. The serial scintigrams revealed that a) 15 of 18 scintigrams were positive within the first week after infarction, b) the number of markedly positive scintigrams decreased promptly after the first week, and c) some scintigrams (11 of 18 at 1 mo, and 3 of 18 at 9 mo) remained positive throughout the study. The possible explanations for persistently positive scintigrams are discussed. Persistently positive scintigrams may hinder the usefulness of Tc-PPi myocardial scintigraphy for the diagnosis of acute myocardial infarction in patients who have had a myocardial infarction within the previous 9 mo.

Acute Disease↗
PubMed1977

Persistently abnormal brain scintigraphy after cerebral infarction.

The current literature indicates nuclear brain images typically return to normal within two to three months following an episode of cerebral infarction. In this report, two patients are described who demonstrated no significant change in their brain scan abnormalities 11 and 17 months following their strokes. Computed tomography confirmed the clinical impression that the persistent brain scan abnormalities were due to cerebral infarction rather than to neoplastic process.

Aged↗
PubMed1977

Comparative evaluation of 99mTc GH, 99mTcO4, and 99mTc DTPA as brain imaging agents.

The brain imaging properties of 99mTc glucoheptonate, 99mTc pertechnetate, and 99mTc DPTA are compared. Results demonstrate that optimum images are obtained at 90, 180, and 180 min., for 99mTc GH, 99mTc DTPA, and 99mTc perterchnetate, respectively. The former two images are not affected by prior bone imaging with 99mTc pyrophosphate, while 99mTc pertechnetate images are adversely affected. 99mTc glucoheptonate appears to be the superior agent for brain imaging, followed by 99mTc DTPA and 99mTc pertechnetate.

Brain Diseases↗
PubMed1977

Gallium bone scan in myelofibrosis: case report.

When gallium is injected into a patient who has received many transfusions, the resultant scan appears similar to a bone scan with renal excretion. This case report presents a 51-year-old man with myelofibrosis and myeloid metaplasia. Gullium-67 and 52Fe scans with 99mTc-pyrophosphate bone scintigrams are included.

Bone Marrow↗
PubMed1977

Estimation of thyroid depth and correction for I-123 uptake measurements.

A new technique has been developed to correct I-123 uptake measurements for the effect of gland depth. The method uses the effect of differential tissue absorption and/or scatter of photons of different energies, and measures the ratio of counts of the primary I-123 emission to the counts of the tellurium K shell x-ray to determine a depth-correction factor. A comparison of this new method against three previously reported methods indicates that the present method provides the most sensitive index of gland depth. The method is sensitive to depth changes, is not significantly dependent on detector distance (p greater than 0.05) for distances greater than 18 cm, and is not dependent on gland size (p greater than 0.25), within the range 20-40 ml. In a group of 40 patients, the ORINS phantom method was found to underestimate the mean gland depth by about 1 cm, thereby causing an average uptake error of 23%. The application of the depth-correction factor was found to change the interpretation of uptake estimates in approximately 10% of the cases in this limited series.

Humans↗