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Mosby's CT Definitions > Part 5 > Flashcards

Part 5 Flashcards

1
Q

What is the streak artifact that occurs at the interface between a high-density object and a lower-attenuation material surrounding it?

A

Edge Gradient

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2
Q

What is the approximation of the relative risk from exposure to ionizing radiation and is calculated by assigning weighting factors to different tissues on the basis of their individual radiosensitivities?

A

Effective Dose

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3
Q

What is effective dose measured in?

A

Sieverts (Sv)

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4
Q

What is the calculated mAs per acquired slice with a multislice CT (MSCT) system?

A

Effective mAs

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5
Q

What is the slice sensitivity profile (SSP) of the reconstructed CT section?

A

Effective Section Width

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6
Q

What is measured at the full width at half maximum (FWHM) of the SSP for a given CT acquisition?

A

Effective Section Width

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7
Q

What does SSP stand for?

A

Slice Sensitivity Profile

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8
Q

What does FWHM stand for?

A

Full Width at Half Maximum

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9
Q

What is a graphical representation of the electrical activity of the heart recorded over time through electrodes placed on the patient’s skin?

A

Electrocardiogram (ECG)

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10
Q

What does ECG stand for?

A

Electrocardiogram (ECG)

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11
Q

What is a specialized CT design devoid of moving parts?

It also utilizes a beam of electrons bombarding a tungsten target to produce x-radiation.

A

Electron Beam CT (EBCT)

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12
Q

What does EBCT stand for?

A

Electron Beam CT (EBCT)

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13
Q

What type of systems are capable of extremely short exposure times and have their greatest application in cardiac imaging?

A

Electron Beam CT (EBCT)

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14
Q

What is the contrast phase of the liver when hepatic parenchymal enhancement dissipates and there is minimal attenuation difference between the intravascular and extravascular spaces?

A

Equilibrium Phase

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15
Q

What contrast phase usually occurs at 2 to 3 minutes after the initiation of contrast agent administration?

A

Equilibrium Phase

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16
Q

What is a delayed imaging renal enhancement phase that begins approximately 3 minutes after the initiation of contrast agent administration?

A

Excretory Phase

17
Q

In what phase has contrast material has been excreted into the renal calyces, opacifying the renal pelvis and the remainder of the urinary collecting system (ureters, bladder)?

A

Excretory Phase

18
Q

What is the ability of x-rays to ionize a volume of air?

A

Exposure

19
Q

What is exposure measured in?

A

Roentgens (R)

20
Q

What is the escape of contrast material outside the blood vessel into the surrounding soft tissue?

A

Extravasation

Mosby's CT Definitions (20 decks)

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