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Investigation of conjugate imaging using small gamma cameras

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8 Author(s)
Matthews, K.L., II ; Franklin McLean Memorial Res. Inst., Chicago Univ., IL, USA ; Mintzer, R.A. ; Yasillo, N.J. ; Chen, C.-T.
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Initial investigation of the use of full field-of-view small gamma cameras as the detectors of dedicated transportable conjugate imaging systems is reported. A single 4-PMT gamma camera is used to collect conjugate data from a phantom comprising two small (0.87 cm3) hollow capsules in a water-filled cylindrical tank (800 cm3). The capsules and cylinder are filled with 99mTc in a 14.5:1 ratio of activity concentrations. Emission and transmission images of the radioisotope-filled phantom are acquired. The transmission images, as well as flood images of the cameras, are acquired with a 99m Tc sheet source. Data processing of the conjugate image data incorporates corrections for radioactive decay, system sensitivity, and attenuation, including correction for self-attenuation in the source. Region-of-interest analysis on the conjugate mean images results in a 6.3% overestimation of the total activity in the phantom inserts. For comparison, data are acquired also with one head of a commercial three-head camera

Published in:

Nuclear Science Symposium, 1997. IEEE  (Volume:2 )

Date of Conference:

9-15 Nov 1997

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