C5 Orig V2

40問 • 1年前

通報

問題一覧

What is the cm of the universally accepted SID?

100 cm

What will happen if the source-to-image-receptor-distance (SID) is increased? It will increase what?

Image Sharpness

There is an inverse relationship between the SID and the radiation exposure at the image receptor If the SID increases, the IR exposure what?

Decreases

The greater the __, the less magnification the image will suffer.

SID

Exposure index is indirectly proportional to the speed class of operation. True or False

True

CR typically operate at a lower speed class than DR systems. True or False

True

as speed class increases, so does the amount of?

Image Noise

allows the radiographer to match the exposure to the desired speed class of operation.

Exposure Index

defined as the log to the base 10 of the incident light intensity divided by the transmitted intensity.

Optical Density

Number of Speed class used in Film-screen systems for general radiography

400-speed class

Bucky factor changes with the change of what? K, GR

- change in kVp - change in grid ratio

ratio of x-rays arriving at the grid (incident radiation), and those being transmitted through the grid

Bucky Factor

defines the requirement to increase the exposure factors to maintain density with the use of a grid.

Grid Factor

- ratio of radiation on the anti-scatter grid to the transmitted radiation - reflects the increased radiation dose required from anti-scatter grid use, as any increase in mAs proportionally increases dose.

Bucky Factor

states that as long as mAs is the same, any combination of mA and time can be used to produce the same quantity of radiation and therefore the same density

Reciprocity Law

As one factor changes, however, the other must also change equally in the what? to maintain proper exposure

Opposite Direction

Ignoring the reciprocity law causes?

Underdeveloped/Overexposed photos.

the reaction of a photographic emulsion to light will be equal to the products of the intensity of that light and the time of the exposure.

Reciprocity Law

To calculate milliampere seconds (mAs), multiply the Milli-amp by

time in seconds.

reduces radiographic contrast

Scattered radiation or high kVp: because high kVp increases scatter radiation

low kVp beam will produce a radiograph with what level of contrast?

high

A high kVp beam will produce a radiograph with what level of contrast?

Low contrast

exposure factor that controls radiographic contrast.

kVp

refers to the concentration, in air, of x-rays at a specific point and is the ionization produced in a specific volume of air

Exposure

- product of the mA and time and is calculated by multiplying the mA by the time. - represents the total quantity of x-rays produced in a beam.

mAs

What is the formula in computing the kVp?

measured thickness in centimetres x 2 + 40 = initial kVp

6 Influencing factors for Receptor Exposure AGFCAP

- Automatic Exposure Control - Grid - Filtration - Collimation - Anode Heel Effect - Patient Factors

4 Receptor Exposure Prime Factors MEKS

- mA - Exposure Time - kVp - SID

Exposure Indicator Names SRIEE

- S-number, - REG, - IgM, - Exl - Exposure Index.S

is a vendor-specific value that provides the radiographer with an indication of the accuracy of their exposure settings for a specific image (ASRT, 2010).

Indicator

- measure of radiation in the relevant image region on the receptor. - function of the region of interest (ROI) selected by the digital radiography workstation for the examination type, image processingn, exposure used

Exposure Index

2 types of digital image receptors DSS IPSPP

- Direct Solid State - Indirect Photostimulable Phosphor Plates

are the receptors for the digital image, instead of using traditional x-ray film.

Sensors

Does CR and DR use chemicals? Yes or No?

A digital image is stored and can be post processed by changing what? MOBC

- Magnification - Orientation - Brightness - Contrast

uses a special electronic x-ray detector, which converts the radiographic image into a digital picture for review on a computer monitor

Digital Radiography

PACS meaning

Pictures Archiving and Communications System

The ___ layer of the flat panel detector houses the thin-film transistor (TFT)

2nd

The ____ layer of the flat panel detector is composed of the x ray converter

1st

3 things integrated into the flat panel device SS, SRO, DE

- Signal storage - Signal read out - Digitizing electronics

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RPC L2

RPC L2

RPC L3

RPC L3

RPC L4

RPC L4

ALE

ALE

RPC L5

RPC L5

RPC M1

RPC M1

RPC M1/2

RPC M1/2

RPC M2

RPC M2

RPC M2.5

RPC M2.5

RPC M3

RPC M3

問題一覧

What is the cm of the universally accepted SID?

100 cm

What will happen if the source-to-image-receptor-distance (SID) is increased? It will increase what?

Image Sharpness

There is an inverse relationship between the SID and the radiation exposure at the image receptor If the SID increases, the IR exposure what?

Decreases

The greater the __, the less magnification the image will suffer.

SID

Exposure index is indirectly proportional to the speed class of operation. True or False

True

CR typically operate at a lower speed class than DR systems. True or False

True

as speed class increases, so does the amount of?

Image Noise

allows the radiographer to match the exposure to the desired speed class of operation.

Exposure Index

defined as the log to the base 10 of the incident light intensity divided by the transmitted intensity.

Optical Density

Number of Speed class used in Film-screen systems for general radiography

400-speed class

Bucky factor changes with the change of what? K, GR

- change in kVp - change in grid ratio

ratio of x-rays arriving at the grid (incident radiation), and those being transmitted through the grid

Bucky Factor

defines the requirement to increase the exposure factors to maintain density with the use of a grid.

Grid Factor

Bucky Factor

states that as long as mAs is the same, any combination of mA and time can be used to produce the same quantity of radiation and therefore the same density

Reciprocity Law

As one factor changes, however, the other must also change equally in the what? to maintain proper exposure

Opposite Direction

Ignoring the reciprocity law causes?

Underdeveloped/Overexposed photos.

the reaction of a photographic emulsion to light will be equal to the products of the intensity of that light and the time of the exposure.

Reciprocity Law

To calculate milliampere seconds (mAs), multiply the Milli-amp by

time in seconds.

reduces radiographic contrast

Scattered radiation or high kVp: because high kVp increases scatter radiation

low kVp beam will produce a radiograph with what level of contrast?

high

A high kVp beam will produce a radiograph with what level of contrast?

Low contrast

exposure factor that controls radiographic contrast.

kVp

refers to the concentration, in air, of x-rays at a specific point and is the ionization produced in a specific volume of air

Exposure

- product of the mA and time and is calculated by multiplying the mA by the time. - represents the total quantity of x-rays produced in a beam.

mAs

What is the formula in computing the kVp?

measured thickness in centimetres x 2 + 40 = initial kVp

6 Influencing factors for Receptor Exposure AGFCAP

- Automatic Exposure Control - Grid - Filtration - Collimation - Anode Heel Effect - Patient Factors

4 Receptor Exposure Prime Factors MEKS

- mA - Exposure Time - kVp - SID

Exposure Indicator Names SRIEE

- S-number, - REG, - IgM, - Exl - Exposure Index.S

is a vendor-specific value that provides the radiographer with an indication of the accuracy of their exposure settings for a specific image (ASRT, 2010).

Indicator

Exposure Index

2 types of digital image receptors DSS IPSPP

- Direct Solid State - Indirect Photostimulable Phosphor Plates

are the receptors for the digital image, instead of using traditional x-ray film.

Sensors

Does CR and DR use chemicals? Yes or No?

A digital image is stored and can be post processed by changing what? MOBC

- Magnification - Orientation - Brightness - Contrast

uses a special electronic x-ray detector, which converts the radiographic image into a digital picture for review on a computer monitor

Digital Radiography

PACS meaning

Pictures Archiving and Communications System

The ___ layer of the flat panel detector houses the thin-film transistor (TFT)

2nd

The ____ layer of the flat panel detector is composed of the x ray converter

1st

3 things integrated into the flat panel device SS, SRO, DE

- Signal storage - Signal read out - Digitizing electronics