Chung Ting Tang MSc, BSC, Abstract Co-Author: Nothing to Disclose

Martin Wai-Ming Law PhD, Presenter: Nothing to Disclose

Cheuk Man Tong, Abstract Co-Author: Nothing to Disclose

Ting Kun Au Yong MBChB, Abstract Co-Author: Nothing to Disclose

K. K. Wu MBChB, Abstract Co-Author: Nothing to Disclose

Y H Hui MBChB, Abstract Co-Author: Nothing to Disclose

This study is to investigate the capability of the compensate of the collimator detector response embedded in the 3D OSEM reconstruction algorithm and whether the compensation would allow the acquisition time of the Myocardial Perfusion Imaging Studies to be halved.

An Anthropomorphic torso phantom and a cardiac phantom were used in this study. The cardiac phantom have three defects, the first defect, volume 5.1ml is located in between the mid/basal anterolateral region, the second defect, volume 2.9ml is in the mid inferoseptal region and the third defect is an air bubble, volume about 2ml, located in between the apex and apical anterior region. The cardiac phantom and the liver compartment of the Torso phantom were injected with 0.25mCi of Tc99m and SPECT images were acquired using different scanning protocol (Full-time & Half-time) with Low energy high resolution (LEHR) and Low energy all purpose (LEAP) collimators. The measurement was repeated using TI-201. Acquired data were reconstructed using Filtered Back Projection (FBP) and 3D OSEM and were analyzed by two Nuclear Medicine Physicians.

For the SPECT images acquired using both LEHR & LEAP collimators, defects in the cardiac phantom were more visible in the half-time SPECT images reconstructed using 3D OSEM compared to the images reconstructed with Full-time FBP for both Tc99m and TI-201 using LEHR and LEAP collimators.

3D OSEM has showed its capability to perform half-time Myocardial Perfusion Imaging studies. The quality of the Half-time Myocardial Perfusion Images reconstructed using 3D OSEM is equally relevant or better to Full-time images reconstructed using FBP. 

The examination time and the examination waiting time of Myocardial Perfusion Imaging could be shorten.

Tang, C, Law, M, Tong, C, Au Yong, T, Wu, K, Hui, Y, Capability of 3D Ordered Subset Expectation Maximization (OSEM) Reconstruction Algorithm in Performing Half-time Myocardial Perfusion Imaging Studies.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14017016.html