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Physics

memorize.aimemorize.ai (lvl 286)
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41 cards
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Section 1

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mammography

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Physics
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Last updated

6 years ago

Date created

Mar 1, 2020

Cards (41)

Section 1

(41 cards)

mammography

Front

The smallest digital detectors (approximately 100 microns) provide the best spatial resolution and, therefore, are best-suited for use in

Back

Cesium iodide, gadolinium oxysulfide

Front

The X-ray scintillator layer used with indirect flat-panel digital detectors is usually either _____________ or ______________.

Back

Dose equivalents for report period Dosimeter type Radiation quality

Front

Personal radiation monitor reports must include which of the following information?

Back

13

Front

The voltage ripple associated with a three-phase, six-pulse rectified generator is about __%

Back

solid state diodes

Front

Circuit devices that permit electrons to flow in only one direction are

Back

xray tube

Front

7

Back

look up table

Front

the ... refers to the default gradient curve applied to the data set of an image determining initial display of contrast

Back

falling load generator

Front

What is used to maximize heat loading potential of an x-ray machine

Back

sensitometer

Front

___ is used to give a precise exposure to a film emulsion

Back

rectifier

Front

5

Back

phosphorescence

Front

The continued emission of light by a phosphor after the activating source has ceased is termed

Back

B

Front

Which of the dose-response curve(s) shown in Figure 3-2 illustrate(s) a linear threshold response to radiation exposure?

Back

penetrometer

Front

A __ can be used to show variations in contrast resulting from kV; also known as an aluminum step wedge

Back

primary coil

Front

2

Back

matrix size

Front

refers to the number of pixels that make up the image and may refer to the number of detected elements that comprise the active FOV or the detector

Back

off-level error

Front

which error can occur when the planes of the x-ray tube are angled against the lead strips of a grid during exposure?

Back

Fluorescence

Front

occurs when an intensifying screen absorbs x-ray photon energy, emits light, and then ceases to emit light as soon as the energizing source ceases

Back

dynamic range

Front

the ... is the range of exposures over which a detector can acquire image data

Back

linear nonthreshold

Front

Late or long-term effects of radiation exposure are generally represented by which of the following dose-response curves?

Back

autotransformer

Front

1

Back

Collimator accuracy test

Front

this demonstrates what kind of test

Back

improved spatial resolution. improved heat capacity.

Front

According to the line-focus principle, an anode with a small angle provides

Back

secondary coil

Front

3

Back

automatic brightness control

Front

Which of the following systems function(s) to compensate for changing patient/part thicknesses during fluoroscopic procedures?

Back

modulation transfer function

Front

What term refers to the measure of the ability of the imaging system to preserve signal contrast as a function of spatial resolution

Back

compton

Front

__- interaction is the primary source of radiation in diagnostic radiography, as a result of scattering of the photon after interaction of an incoming photon with a loosely bound electron in the outer orbits of an atom

Back

1. barium fluorohalide (0ver this is protective layer) 2. reflective layer 3. base 4. antistatic layer 5. lead foil

Front

The layers of the PSP storage pate are:

Back

step down

Front

what transformer is located in the filament circuit?

Back

filament circuit

Front

the... take incoming line power and produced thermionic emission from the filament wire

Back

scattering

Front

What is the term used to describe x-ray photon interaction with matter and the transference of part of the photon's energy to matter?

Back

denistometer

Front

Which instrument is commonly used in QA programs to measure varying degrees of x-ray exposure?

Back

Bremsstrahlung (Brems)

Front

, a high-speed electron, accelerated toward a tungsten atom, is attracted (and "braked," that is, slowed down) by the positively charged nucleus and therefore is deflected from its original course with a resulting loss of energy. This energy loss is given up in the form of an x-ray photon. The electron might not give up all its kinetic energy in one such interaction; it might go on to have several more interactions deeper in the target, each time giving up an x-ray photon having less and less energy.

Back

photoelectric interaction

Front

which photon-tissue interaction results in the complete absorption of an incoming x-ray photon to produce contrast in a radiographic image

Back

histogram

Front

a ___ is a data set in graphical form of the prevalence of digital pixel values versus the prevalence of those values in the image

Back

grounded milliamperage meter

Front

4

Back

vaporized tungsten on glass envelope

Front

The most common cause of x-ray tube failure is

Back

spinning top

Front

which device tests the accuracy of the x-ray machine or rectifiers

Back

air kerma

Front

The x-ray unit of exposure defines

Back

image intensifier

Front

What receives remnant beam, converting it into light, then increasing the brightness of the light?

Back

characteristic

Front

In this case, a high-speed electron encounters the tungsten atom and ejects a K-shell electron, leaving a vacancy in the K shell. An electron from a shell above (e.g., the L shell) fills the vacancy

Back

Bremsstrahlung

Front

Which of the following does Figure 5-6 represent?

Back