Details

Autor(en) / Beteiligte

• Mah, Eugene

Titel

A reprojection method for performing attentuation correction in SPECT imaging

Ort / Verlag

ProQuest Dissertations & Theses

Erscheinungsjahr

1996

Quelle

ProQuest Dissertations & Theses A&I

Beschreibungen/Notizen

• One of the major factors affecting quantitative SPECT is the problem of photon attenuation. It is well known that approximately 50% of the photons emitted from Tc-99m (140 keV) will be absorbed by about 5 cm of water. Because of this, several methods have been developed to correct SPECT images for photon attenuation. Many methods currently being investigated are iterative methods which are computationally intensive and require many iterations to produce a solution. In this work, a method is developed based on using reconstructed images to estimate the contribution of each source voxel to the raw projection data. Each pixel in the image is reprojected and weighted with an exponential attenuation length exp ($\int$$\mu\ (x,y)\ dy)$ evaluated from the pixel to the detector. The weighting factor is determined from an attenuation map obtained using a transmission scan. The research presented here will investigate the potential usefulness of the attenuation correction method developed using several phantom studies.