SPECT

Question 1

What does SPECT stand for?

Answer 1

Single Photon Emission Computed Tomography

Question 2

• It uses single photon
• It is an emission-based imaging
• It uses algorithms (CT) and produces 3D imaging
• Common in Nuclear Medicine imaging modality

Answer 2

SPECT

Question 3

It is the 3D Version of the 2D (planar imaging) gamma camera technology
- It uses 1 or 2 gamma camera heads that rotates around the patient.
- It combines conventional scintigraphic and computed tomographic methods.

Answer 3

SPECT as Gamma Camera & CT

Question 4

decodes the energy of the emitted photon

Answer 4

Pulse Height Analyzer (PHA)

Question 5

These are areas of increased uptake

Answer 5

Hot spots

Question 6

These are areas of decreased uptake

Answer 6

Cold/Dark Spots or Photopenia

Question 7

Detectors are placed _________ to the body of the patient to minimize scatter.

Answer 7

as close as possible

Question 8

What are the radionuclides used in Gamma Camera & Spect CT

Answer 8

Technetium-99m
Thallium-201
Gallium-67
Iodine-131
Iodine-123

Question 9

Types of collimators

Answer 9

low energy, medium energy, high energy

Question 10

collimator used for radionuclides emitting photons up to 160 keV

Answer 10

low energy

Question 11

collimator used for radionuclides emitting photons up to 250 keV

Answer 11

medium energy

Question 12

collimator used for radionuclides emitting photons greater than 250 keV

Answer 12

high energy

Question 13

These can be found in front of the detectors, and this is essential to provide positional information, and minimize scatter or false events. They typically consist of a lead drilled with tens of thousands of closely packed holes, separated from each other by septa

Answer 13

collimators

Question 14

collimator design that has multiple holes which run parallel to each other (most common design)

Answer 14

parallel hole

Question 15

collimator design that has single hole with a single aperture, providing a magnified and
inverted image with superior spatial resolution. Used in imaging small
structures.

Answer 15

pinhole

Question 16

collimator design that has multiple holes which converge onto a central point, providing a magnified image with improved spatial resolution. Used in imaging small structures.

Answer 16

converging

Question 17

collimator design that has multiple holes which fan away from the center, providing a minified image. Used in whole body imaging where a larger field of view is required.

Answer 17

diverging

Question 18

usually NaI (Tl) Crystal; it
converts gamma rays to light photons

Answer 18

SCINTILLATION CRYSTALS

Question 19

converts energy from visible light to electrons

Answer 19

PHOTOMULTIPLIER TUBE (PMT)

Question 20

for data analysis (uniformity correction and linearity) and process data-readable image

Answer 20

computer

Question 21

it is for display

Answer 21

monitor