Physics and Radiobiology of Nuclear Medicine

When the distribution of activity is such that spatial frequency increases, the peaks and valleys come closer. When the peaks an ...

It is appropriate to mention that whereas the FWHM of the LSF does not account for the scatter and septal penetration of g-radia ...

Collimator Efficiency Collimator efficiency, or geometric efficiency (Eg), is defined as the number of g-ray photons passing thr ...

spatial resolution [see Eq. (10.2)]. Thus,for a given collimator, as the spatial resolution of a system increases, its sensitivi ...

window or adjusts the pulse height to compensate for the variations. This is performed in real-time during the data collection i ...

Edge Packing Edge packing is seen around the edge of an image as a bright ring and results in nonuniformity of the image. This r ...

Effects of High Counting Rates As discussed in Chapter 8, the scintillation cameras suffer count losses at high counting rates d ...

Statistical variations of the count rates give rise to noise that increases with decreasing information density or count density ...

(peaking), uniformity, and spatial resolution of the camera. These tests can be carried out with the collimator attached to the ...

using a low-energy high-resolution collimator. If the peak shift is more than 10%, the camera must be tuned. Tuning is performed ...

where “high” and “low” are the maximum and minimum differences in counts over five contiguous pixels in all rows and columns of ...

(c) A system with a spatial resolution of 5 mm is better than a system with a spatial resolution of 8 mm. True or false? The in ...

(e) If PM tubes and the PHA of a gamma camera have MTFs of 0.5 and 0.7 at a certain spatial frequency, what is the overall MTF o ...

11 Digital Computers in Nuclear Medicine 139 Digital computers were introduced in nuclear medicine practice in the mid- 1960s, b ...

1’s in a row, e.g., 10101, which are equal to a sum of a series of powers of two, as opposed to decimal numbers that are express ...

from memory storage, executes the instructions sequentially, and displays or stores the results in appropriate locations. Transf ...

the use of acquisition and video interfaces via serial or parallel buses. The keyboard and the mouse are the most common input d ...

While analog signals are continuous in time, digital signals consist of a fixed number of bits produced by the ADC by sampling a ...

Thus if an image of 250 ×250 mm FOV is obtained in a matrix of 128 × 128 mm, the pixel size would be 250/128 ≈2 mm. If the matri ...

photon emission computed tomography (SPECT) studies. In this mode, a matrix is chosen that approximates the entire area of the d ...