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CT Definitions > Definitions > Flashcards

Definitions Flashcards

1
Q

What is an Agatston score?

A

a score calculated from 0- >400 from coronary artery calcification procedures

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2
Q

What is the unit of measurement for Absorbed dose?

A

Gy or mGy

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3
Q

What is the unit of measurement for Equivalent Dose?

A

mSv

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4
Q

What is the unit of measurement for Effective Dose?

A

mSv

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5
Q

Definition of Exposure

A

the number of ionization radiation events in the air

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6
Q

What does Effective Dose represent?

A

risk of radiation induced cancer

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7
Q

What is Coherent Scattering? Ionizing or Non-Ionizing?

A

Coherent Scattering is when a photon is temporarily absorbed by an electron and then shot out with equal energy as it entered, just in a different direction. This is a non-ionizing event

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8
Q

Which ionizing interaction requires total absorption of the x-ray photon and emits an electron? Photoelectric absorption or Compton Scatter?

A

Photoelectric Absorption
Compton Scatter is when only part of the X-ray photon is absorbed, thus liberating part of the photon and part of the electron

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9
Q

What are the by product(s) of Coherent Scattering?

A

A Scattered Photon

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10
Q

What are stochastic effects? give an example

A

Stochastic effects are possible issues that may arise from radiation but can happen at any radiation level and can not be predicted, Example: cancer

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11
Q

What are Deterministic Effects?

A

Deterministic Effects are problems that may arise after a certain threshold of radiation is received

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12
Q

Where are e- sourced from in the x-ray tube?

A

The cathode filament

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13
Q

What does the Intensity of the x-ray beam represent?

A

the number of photons in the beam

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14
Q

How is the energy of the beam measured?

A

KeV, Kilo-eletron Volts

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15
Q

What does the Bowtie Filter do?

A

Shapes the x-ray beam to match the shape of the patient

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16
Q

What is an Edge Gradient Artifact?

A

streaks in images caused by high contrast objects being scanned such as metal

17
Q

what is an appropriate delay scan time for a chest in the venous phase?

A

40 seconds

18
Q

What does image Reconstruction do?

A

converts raw data into image data

19
Q

What do slip rings do?

A

they allow for the continuous spinning of the CT gantry

20
Q

What vein does an 18 g IV go in for contrast studies?

A

proximal basilic verin

21
Q

What is the purpose of the host computer?

A

this allows for short term storage of raw data

22
Q

what kind of injection is used for Urography in the excretory phase?

A

manual hand injection

23
Q
A

CT Definitions (1 decks)

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