COLLIMATION FOR IMAGING MYOCARDIUM .2.

  • 1 January 1976
    • journal article
    • research article
    • Vol. 17  (8) , 719-723
Abstract
Line-source response functions and modulation transfer functions (MTF) were used to compare the spatial resolutions obtained with an Anger camera system and 4 different nuclides used as human myocardial-imaging agents: 99mTc, 123I, 201Tl and 43K. The measurements were made with a low-energy converging collimator (LEC), a medium-energy converging collimator (MEC), and a pinhole collimator. The MTF values for 99mTc were very similar for all 3 collimator types, although the LEC collimator gave slightly higher values at high spatial frequencies and had 40% greater sensitivity. 123I was satisfactorily imaged only with the MEC and pinhole collimators, which in turn yielded MTF values comparable to those measured for 99mTc. 201Tl produced MTF curves that were similar for the MEC and pinhole collimators; the curve for the LEC collimator was slightly poorer. All 3 MTF curves for 201Tl were inferior to those of 99mTc. For imaging with 43K, only the pinhole collimator provided marginally acceptable spatial resolution.

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