CT Quality Assurance and Dosimetry

These flashcards cover key terms and concepts related to CT Quality Assurance and Dosimetry based on the provided lecture notes.

Dosimetry

The determination and measurement of the amount or dosage of radiation absorbed by a substance or living organism.

Penumbra

The part of a shadow in which there is a small amount of illumination from a light source.

Scanogram

A planning radiograph taken prior to a CT scan, also known as a Topogram or Surview.

MPR

Multiplanar Reformation, a technique in CT imaging to reconstruct images in different planes.

CTDI

Computed Tomography Dose Index, a standardized measure of radiation dose output of a CT scanner.

DLP

Dose Length Product, a measure that combines output radiation intensity, CTDIvol, and the volume of tissue imaged.

Noise

Equivalent to quantum mottle in radiography, representing random statistical variations in CT numbers.

Uniformity

CT numbers should be equal throughout the scanned area.

Spatial Resolution

The scanner's ability to resolve closely placed objects that are significantly different from their background.

Contrast Resolution

The ability of the scanner to observe low-contrast objects whose density differs slightly from the background.