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REVIEWER > Computed Tomography > Flashcards

Computed Tomography Flashcards

1
Q

The number of photons absorbed by the detector and dependent on the physical properties of the detector face

A

Absorption Efficiency

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2
Q

Filter the x-ray beam to reduce the radiation to the patient and help minimize image artifact and improve quality

A

Compensating filters

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3
Q

Dose Reported to the FDA

A

Computed Tomography Dose Index (CTDI)

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4
Q

Elements in a CT system that collect attenuation information and measures the intensity of the transmitted x-ray radiation along beam projected from the x-ray source to that particular detector element

A

Detector

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5
Q

A direct plane is one that can be obtained by positioning the patient in a specific position

A

Direct Axial Plane

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6
Q

A technique for expressing a waveform as a weighted sum of sines and cosines

A

Discrete Fourier Transform (DFT)

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7
Q

A technique of interpolating helical scan data for SDCT systems using the 360° linear interpolation

A

360° Linear Interpolation

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8
Q

Process of Moving the table by a specific measure

A

Table Incrementation

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9
Q

An acute Impairment of renal function that follows the intravascular administration of contrast material for which alterations causes have been excluded

A

Contrast media-induced Nephropathy (CIN)

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10
Q

Scanner Configuration that consists of a detector array and an x-ray tube that produces a fan shaped beam that covers the entire field of view and a detector array

A

third generation design

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11
Q

It is determined how rapidly data are acquired and is controlled by gantry rotation speed, the number of detector channels in the system, and the speed with which the system can record changing signals.

A

Temporal Resolution

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12
Q

When the table position is manually set at zero by the technologist

A

Table Referencing

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13
Q

The difference between the measured CT number of a given tissue and the known value for that tissue

A

System Noise

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14
Q

Low-voltage electrical contacts within the gantry designed to allow continuous rotation of an x-ray tube without the use of cables connecting internal and external components

A

Slip rings

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15
Q

Detector rows that have variable widths and sizes

A

Adaptive / Nonuniform / Hybrid array

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16
Q

Determines the extent a patient can be scanned without repositioning

A

Scannable range

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17
Q

Size of detector opening

A

Detector aperture

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18
Q

Entire collection of detectors included in a CT system

A

Detector array

19
Q
  • Ability of a system to resolve, as separate form, small objects that are very close together.
  • also call high contrast resolution or detail resolution
A

Spatial Resolution

20
Q

electromechanical devices that use a brushlike apparatus to provide continuous electrical power and electronic communication across a rotating surface, permitting the gantry frame to rotate continuously, eliminating the need to straighten twister system cables

A

Slip Rings

21
Q

The leakage of fluid from a vein into the surrounding tissue during IV contrast administration

A

Contrast Media Extravasation

22
Q

Process used to generate three-dimensional images that show the surface of a three-dimensional object

A

Shaded surface Display (SSD) or Surface rendering

23
Q

Early systems, which contained only a single row of detectors in the z axis, obtained data for one slice with each rotation

A

Single Detector Row CT (SDCT)

24
Q

The number of x-ray photons detected per pixel in CT

A

Single to nose Ratio (SNR)

25
Q

The process requires a scan acquisition, needle placement, another scan acquisition, adjustment of the needle, another scan acquisition, and so forth until the needle is confirmed to be in the correct location

A

sequential CT

26
Q

Factors that can be controlled by the operator and affect the quality of the image produced (e.g. mA, scan time, slice thickness, FOV, reconstruction algorithm, and kVp)

A

Scan Parameters

27
Q

Electronic component of CT scanner that measures remnant radiation exiting the patient, converting the radiation to an analog signal proportionate to the radiation intensity measured

A

Detector assembly

28
Q

A brief, persistent flash of scintillation that must be taken into account and subtracted before image reconstruction

A

Afterglow

29
Q

The disadvantage of solid state detector over xenon gas detector

A

Afterglow

30
Q

Changes the digital signal from the computer memory back to an analog format so that the image can be displayed on the monitor

A

Digital to analog converters (DAC)

31
Q

Measured from the middle of the one detector to the middle of the neighboring detector

A

Detector spacing

32
Q

They result when wide slices are used as source images

A

Stair-step artifacts

33
Q

Instructions that tell the computer what to do and when to do it

A

Software

34
Q

Ability of the detector to capture transmitted photons and change them to electronic signals

A

Detector efficiency

35
Q

Artifacts that relate to the cone-shaped beam required for MDCT helical

A

Cone beam artifacts

36
Q

Method of acquiring slices in which one slice abuts the next

A

Continuous

37
Q

Ability of the system to differentiate between objects with similar densities

A

Contrast detectability or low contrast resolution

38
Q

Included in the detector array and help to calibrate data and reduce artifacts

A

Reference Detector

39
Q

Determines how the data are filtered in the reconstruction process

A

Reconstruction algorithm

40
Q

Table movement per rotation divided by the selected slice thickness of the detector

A

Detector pitch

41
Q

The section of data selected for display on the image

A

Display field of view (DFOV)

42
Q

Process of creating a digital image from raw data

A

Reconstruction

43
Q

Processing of using the same raw data to later generate a new image

A

Retrospective Reconstruction

44
Q

Output device that allows the information stored in computer memory to be displayed

A

Display Monitor

REVIEWER (3 decks)

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