PT  - JOURNAL ARTICLE
AU  - Ratzlaff, Neil W.
AU  - Brown, Paul H.
AU  - Cox, Deborah J.
AU  - Krishnamurthy, G.T.
TI  - The Effects of Collimator Malpositioning in Seven Pinhole Tomography
DP  - 1984 Jun 01
TA  - Journal of Nuclear Medicine Technology
PG  - 51--55
VI  - 12
IP  - 2
4099  - http://tech.snmjournals.org/content/12/2/51.short
4100  - http://tech.snmjournals.org/content/12/2/51.full
SO  - J. Nucl. Med. Technol.1984 Jun 01; 12
AB  - We tested the effect of seven pinhole collimator positioning on circumferential count profiles during thallium-201 myocardial imaging by imaging a left ventricular phantom at various angles. The seven pinhole raw data images and profiles were identifiable as malpositioned when the collimator was malpositioned by 10° or more. The phantom’s “cold” spot was shown to propagate into adjacent planes and also into other regions of the heart as a function of collimator positioning. We then developed a method for systematically positioning the collimator correctly, which should aid in preventing similar artifacts in clinical studies.