November 2013 Vol. 1 No. 1

Full Length Research Paper

Fine tuning and alignment of the Large Field of View (LFOV) gamma camera board

¹P. K. Obeng, ¹B. K. Banini, ²*John Kutor, ¹E. Mornoh and ¹C. A. Ashong

¹Engineering Services Centre (ESC), Ghana Atomic Energy Commission Legon, Accra.
²Biomedical Engineering Department, University of Ghana, Legon-Accra.

*Corresponding Author's E-mail: jkutor@ug.edu.gh

Accepted August 12, 2013
 

Abstract

Processor boards alignment, fine tuning and quality control have been carried out on the Siemens large field of view (LFOV) Gamma Camera at Nuclear Medicine Centre at Korle-Bu Teaching Hospital (KBTH) after a damaged power supply board was restored. The input voltages i.e. various low and high voltage values were checked after the restoration to be +14.995V, -14.998, +12.001V, 12.000V, +5.000V,-5.001V, -100.000V, 200.000V which were within the standard range.. The integral uniformity for the central field of view (CFOV) after the fine tuning and alignment was found to be 1.64% whiles the integral uniformity for useful field of view (UFOV) was 1.67%. The differential uniformity for the CFOV was 1.13% while that of the UFOV was 1.26%. The integral and differential uniformities values for CFOV and UFOV were found to be within the acceptable test range of 1% to 4% which conformed to the standard set by NEMA, the manufacturers of the camera. Therefore the performance of the gamma camera after the restoration is good and would not affect interpretations of clinical studies.

Keywords: Alignment, central field, differential uniformity, gamma camera, integral uniformity, tuning.