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Radiology, Vol 121, 405-413, Copyright © 1976 by Radiological Society of North America

ARTICLES

The Mark IV system for radionuclide computed tomography of the brain

DE Kuhl, RQ Edwards, AR Ricci, RJ Yacob, TJ Mich and A Alavi

The Mark IV scanning system is a simple four-sided arrangement of 32 independent detectors which rotate continously as a unit, detecting, processing, and displaying the reconstructed data while the study progresses. Detection is by single photon counting and is compatible with commercially available radionuclides. An empirical correction is applied for attenuation, difference in detector response, and scatter. It is a high-sensitivity device with approximately uniform resolution throughout the section plane. There is good reproducibility and accuracy for absolute quantification of radionuclide concentration in the brain. Clinical applications include scans of 99mTcO4, 99mTc-RBC, 123I-iodoantipyrine, 99mTc-diphosphonate, and 111In-DTPA.




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