Referencing trends in the radiologic literature, 1970-1990.
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Periodicals as Topic↗
Biomedical subjects
R M Slone
Publications and source records attributed to R M Slone.
Musculoskeletal tumors: T1 and T2 relaxation times.
The T1 and T2 relaxation times of primary tumors of the musculoskeletal system were calculated in 54 patients. No correlation was found between the relaxation values and the histopathologic type of the tumors. Lipoma had the same relaxation characteristics as normal fat. Otherwise tumors could be differentiated from normal tissue, but there was no significant difference between malignant and benign tumors, and the mean values for the different histopathologic types differed significantly only in a few instances. Hence T1 and T2 measurements are of limited value for histologic characterization of musculoskeletal tumors.
Bone Neoplasms↗
Magnetic resonance imaging late after tricuspid valvectomy.
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Adult↗
Evaluation of an aortic annular pseudoaneurysm by MRI: comparison with echocardiography, angiography and surgery.
Nuclear magnetic resonance imaging (MRI) was clinically useful in a case of aortic annular pseudoaneurysm complicating bacterial endocarditis. The MRI findings were proven by angiography and surgery. Although surgical correction was attempted, the aneurysm recurred and has been followed by MRI and two-dimensional echocardiography. In addition to two-dimensional echocardiography, MRI represents a useful noninvasive imaging method for diagnosis and follow up of aortic annular pseudoaneurysm.
Adult↗
Varying gradient angles and offsets to optimize imaging planes in MR.
A simple technique for determining the appropriate viewing angle rotations necessary to obtain images in any desired plane is presented, along with an explanation of the imaging coordinates used in magnetic resonance imaging. Viewing angle rotations caused a minimal loss in image quality but no loss in signal-to-noise ratio, and were found to be compatible with both multisection and multiecho acquisitions. Several examples that show the practical applications of these techniques are provided.
Audiovisual Aids↗
Magnetic resonance imaging system stability: temporal variability in signal intensity, signal-to-noise, T1, and T2 measurements on a 0.15-T resistive system.
Signal intensity (SI) variability was evaluated on a 0.15-T resistive instrument using a phantom and was found to increase with time, repetition time (TR), and echo time (TE), ranging from 0.24% standard deviation (SD) over 34 min for 500/30 (TR/TE) images, to 2.1% SD over 5 days for 2000/30 images. Signal-to-noise (S/N) variability increased with time and TE but not TR and ranged from 4.2% SD over 34 min to 7.1% SD over 5 days in 500/30 images. Variability in T1 and T2 measurements on phantoms ranged from 1.8% to 4.8% SD for T1 and 3.6% to 6.5% SD for T2 in the biological range over 5 h. High reproducibility of SI, T1, and T2 measurements was demonstrated over a 6-week period in normal muscle measurements.
Biophysical Phenomena↗