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Flashcards in CT Glosssary Deck (118)
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1

The reformatting of cross-sectional images to produce images of the surfaces of anatomical structures

3D Surface Rendering

2

A mechanism of attenuation in which x-ray photons interact with the patient's tissues and never leave the body

Absorption

3

A hardware component used to increase the strength of a signal

Amplifier

4

Information expressed in a continuous fashion

Analog

5

The component that converts the analog data into digital information to be temporarily stored in the raw data file

Analog-to-Digital Converter (ADCs)

6

The positive terminal of the CT x-ray tube and the part of the tube where the target material is located

Anode

7

Saving the patient's digital images on a long-term storage device

Archiving

8

A specialized computer component used to reconstruct the CT images

Array Processor

9

Annoying anomalies which sometimes appear in CT images

Artifacts

10

A reduction in the number of photons in the x-ray beam as it passes through the tissues in the patient's body

Attenuation

11

A calculation used for reconstructing the final CT images from the raw data by adding together the attenuation information collected from all of the projections

Back Projection

12

A type of oral contrast agent known for providing very good opacification of the bowel, but is slower moving through the GI tract compared to iodinated agents

Barium Sulfate Oral Contrast Agent

13

The increase in the average energy of the x-ray beam as it penetrates tissues

Beam Hardening

14

Refers to the timing immediately following an IV contrast injection defined by at least a 30 HU difference between the abdominal aorta and the inferior vena cava

Bolus Phase of Enhancement

15

X-rays produced as a result of an electron colliding with or passing near the nucleus of an atom in the target

Bremsstrahlung (braking radiation)

16

The negative terminal of the CT x-ray tube and the part of the tube where the negatively charged electrons flow into the tube from the high voltage generator

Cathode

17

X-rays produced as a result of an electron in the target replacing one ejected by a fast-moving incoming electron

Characteristic Radiation

18

Components on the CT scanner that restrict the path of the x-ray photons

Collimator

19

An x-ray tomographic technique which uses computers to reconstruct the images

Computed Tomography

20

A calculation used for reconstructing the final images from the raw data used on multi-row detector scanners with the capability of collecting more than four slices in a single rotation

Cone Beam Reconstruction

21

Having no gaps between adjacent slices

Contiguous

22

Conditions that would preclude a patient from having a CT study performed in a given manner (i.e. with contrast)

Contraindications

23

The ability to differentiate small differences in density on the image

Contrast

24

A compound, usually pharmaceutical in nature, which when administered to a patient, may improve the sensitivity and specificity of the clinical diagnosis

Contrast Agent

25

A study of cross-sectional images characterized by an increment of the patient table after each x-ray tube rotation

Conventional Scan

26

The process of applying a reconstruction filter to the raw data

Convolution

27

Aligned perpendicular to the axis which travels from anterior to posterior in the patient

Coronal

28

Sections made by cutting anything at right angles to any axis

Cross-sections

29

A number that correlates to the Hounsfield scale which ranks various materials by their attenuation properties

CT Number

30

A study which uses IV contrast media to visualize vascular structures

CT Angiography (CTA)