Physics and Radiobiology of Nuclear Medicine

Many commercial software packages are available offering a variety of choices for filters and cut-off values. The selection of a ...

Single Photon Emission Computed Tomography 167 Estimated image Calculated projections of estimated image Compare A & B proje ...

where Cjis the counts (activity) in the jth pixel and aijis the probability that an emission from pixel jis recorded in the ith ...

computation process, and, in general, the computation time decreases with the decreasing number of subsets (i.e., more projectio ...

Efforts are made to co-register the two sets of images, in which the matrix size, voxel intensity, and rotation are adjusted to ...

patient’s organ of interest, and the transmitted beam is detected by an array of detectors. The acquired data are used to recons ...

where mis the linear attenuation coefficient of the photon in tissue and x is the depth of tissue traversed by the photon (Fig. ...

Equation (12.9) is the attenuation correction factor that is applied to the geometric mean counts to obtain the unattenuatted co ...

iterative reconstruction method, the attenuation factor is taken into con- sideration in the estimated image and it is perhaps t ...

factors because contrast-enhanced pixels overestimate attenuation. Some investigators advocate not using contrast agents and oth ...

tion in spatial resolution. Manufacturers provide detailed methods of deter- mining COR alignment for SPECT systems, which shoul ...

Performance of SPECT Cameras Performance of SPECT cameras is assessed by evaluating several parame- ters such as spatial resolut ...

in detail in Chapter 10 for conventional gamma cameras and are equally applicable to multihead SPECT cameras. Quality Control Te ...

placed on the patient table. SPECT data are collected for 360° in a circu- lar orbit of 20 cm, when the detector heads are in 18 ...

An important monthly test for CT scanners is the CT constancy test, which is performed by using the CT quality phantom. The foll ...

English RT, Brown SE.Single Photon Emission Computed Tomography:A Primer. 2nd ed. New York: Society of Nuclear Medicine; 1990. G ...

13 Positron Emission Tomography* 182 Positron emission tomography (PET) is based on the detection in coinci- dence of the two 51 ...

PM Tubes and Pulse-Height Analyzers 183 Detector for PET Several types of scintillation detectors are available for PET scanners ...

184 13. Positron Emission Tomography photons arising from the interaction of g-rays in detectors to pulses, which are used to de ...

PET Scanners 185 the opposite detector. This uncertainty in detection time is called the timing resolution or coincidence timing ...