Clinical Nuclear Medicine Qs

The modulation transfer function (MTF) of an imaging system is the _______________________________ of the system’s line spread function (LSF).

Fourier transform

Among the following radiation measurement and imaging devices, which most closely approximates a 4 counting geometry?

A well counter

In scintillation detectors (Figure 1) [1-4], radiation interacts with and deposits energy in a _________________

scintillation crystal

The image shown below is a whole-body gamma-camera scan of 131I-iodide in a patient with metastatic thyroid cancer. It exhibits a pronounced “starburst” image artifact in the neck area. What is the cause of this artifact?

Collimator septal penetration

For SPECT, the maximum acceptable angular increment between successive projection images is approximately

3 degrees

Time-of-flight improves lesion detectability in PET images due to improved

signal-to-noise ratio

For yttrium-90, a pure beta ray-emitting radionuclide, administered systemically to a patient, the absorbed dose to the thyroid from activity in the liver

is 0 rad

In mathematical terms, a compartmental model is essentially

a system of linked differential equations

The current release criteria for radionuclide therapy patients (for example, I131-treated thyroid cancer patients) state that such patients can be released

when the projected dose to individuals around the patient is 0.5 rem or less.

For a typical diagnostic Nuclear Medicine procedure, the effective dose to the patient is about

1 rem

Which of the following scintillator detector materials is used in current PET scanners?

LSO, LYSO, GYO

In current PET scanners, the method for re-binning 3D data into 2D data is

Fourier re-binning (FORE)

It is __________________ that filtered back-projection remains the most widely used tomographic image reconstruction method in SPECT and PET.

false