QAQC 2
問題一覧
1
•AKA Light Beam Diaphragm (LBD)
"It provides the radiographer with an easy to use accurate method of controlling the size of the X-ray field and placing it over the area of interest, thus reducing the radiation dose to the patient and improving the quality of the image.
•It is vulnerable to knocks often resulting in inaccuracy of the light beam/X-ray beam coincidence blown light bulbs, electrical and mechanical problems.
collimator
2
TRUE OR FALSE
COLLIMATOR
-Visual inspection
•Accuracy of scales
•Change a light bullo
•Light beam/x-ray beam alignment and centering
• Lead shutter efficiency
true
3
TRUE OR FALSE
VISUAL INSPECTION
-Rotation
- Stability
-Knobs for shutter control
-Accuracy of shutter setting scales (if present)
-Shutter chain drive
•Shutters
•Housing
-Window
-Light timer
-Timer switch
-Cables
-Plugs
-Light bulb
-Light/ x-ray beam alignment
true
4
Frequency of collimator
every 6 months
5
TRUE OR FALSE
Method collimators
-Set 100 cm focus to tabletop distance
-Using the 100cm FFD (SID) scale on the collimator, set various aperture sizes with the light on and measure the resultant light areas at table top level.
"Compare with settings on the collimator.
•Evaluation
•Light area measured should be the same as the setting on collimator
•Action
•If settings are not accurate and the solution is not a simple one, call an X-ray engineer
"File a report
true
6
Frequency of changing a light bulb
as necessary
7
Frequency of light beam or xray beam alignment test
6 months or as necessary
8
TRUE OR FALSE
LIGHT BEAM/X-RAY BEAM ALIGNMENT TEST
The purpose of the light in a collimator is to allow more accurate collimation of the X-ray beam. The light must, therefore, coincide with the X-ray beam. The light beam relies on the accurate positioning of the light bulb and angled mirror inside the collimator.
Frequency: every 6 months or as necessary
•Equipment required
One 24 x 30 cm loaded cassette.
Alignment test tool. Commercially made test tools are available, but a simple alternative is to use eight coins or four paper clips Lead marker or ninth coin
true
9
Closing the shutters in the collimator fully should prevent any radiation from reaching the film. Useful for testing radiation safety when discharging capacitor discharge mobiles or making tube warm up exposures.
-Frequency: every 6 months
•Equipment required: One loaded 24 x 30 cm cassette.
shutter efficiency test
10
Frequency of shutter efficiency test
every 6 months
11
Frequency of cassette inspection
yearly or as necessary
12
Method of cassette inspection
hinges,catches,casing,cleanliness
13
Frequency of light leakage test
yearly or as necessary
14
Frequency intensifying screen inspection
monthly
15
Frequency of film or screen contact test
yearly or as necessary
16
The purpose of the _________ is to reduce the amount of scattered radiation reaching the film. This greatly improves the quality of the image
A _________ looks like a simple thin sheet of soft metal, but it is in fact a precision made piece of equipment and easily damaged
It is made up of a large number of fine lead ships interspaced between radiolucent strips.
If the lead strips become distorted the grid will be less efficient and irregular densities will be created on the film.
grid
17
Types of grid
stationary,moving,parallel line
18
• A loose grid which can be placed directly over the face of the cassette.
• The grid and cassette size must be the same.
• The grid ratio is usually 6: 1 or 8: 1.
• Cassettes are available with a built in, or added, grid.
stationary grid
19
• Two sets of lead strips superimposed and running at 90 degrees to one another.
• Generally a stationary grid, used only for relatively high kV work and when no tube angulation is necessary.
• This design is used only in stationary grids.
cross hatch
20
• A grid used in a potter bucky system, which moves from side to side during the X-ray exposure, in order to defuse out the images of the lead strips.
• The grid ratio is usually 10: 1 or 12: 1.
• The grid ratio should be 16: 1 if used for high kV work.
moving grid
21
Moving grid ratio usually
10:1 or 12:1
22
Stationary grid ratio usually
6:1 or 8:1
23
• Lead strips run parallel to one another in one direction only.
• There are two types of parallel line grid, focused and non-focused.
• Moving and stationary grids are all of parallel construction.
parallel line grids
24
• A parallel line grid.
• Relationship of lead strips uniform to one another throughout.
non focused
25
• A parallel line grid.
• Differs from the non focused grid only in that the lead strips progressively incline more inward, the further they are from the centre line, so that they are focused to a predetermined point above the grid.
focused
26
The ratio of the height of the lead strips to the distance between them.
grid ratio
27
The number of lead strips in a grid. Stated as the number of lead strips to the centimetre (or to the inch).
grid line
28
Grids are designed to be used within given focus film distances {source image distances} dependent on the way the lead strips have been focused.
focal range
29
The direction in which the grid lines travel is indicated by a line down the center of the grid on the tube side.
Crosshatch grids have a second line running at _______ to the first.
90 degrees
30
Frequency of grid damage test
6 months or as necessary
31
A viewing box, or light box, is a simple but important aid to viewing radiographs and is commonly used throughout X-ray departments.
It consists of an even light source of sufficient light intensity to allow optimum viewing.
Viewing a radiograph under good viewing conditions is important in order to visualise the maximum amount of information.
viewing box or negatoscope
32
Frequency of Visual inspection of positioning pads
weekly or as necessary
33
Frequency of positioning pad test in xray
6 months or as necessary
magnetic resonance imaging 2
magnetic resonance imaging 2
Kenneth Manlapaz · 78問 · 1年前magnetic resonance imaging 2
magnetic resonance imaging 2
78問 • 1年前computed tomography
computed tomography
Kenneth Manlapaz · 46問 · 1年前computed tomography
computed tomography
46問 • 1年前interventional radiology 2
interventional radiology 2
Kenneth Manlapaz · 58問 · 1年前interventional radiology 2
interventional radiology 2
58問 • 1年前Radiationtherapy
Radiationtherapy
Kenneth Manlapaz · 79問 · 1年前Radiationtherapy
Radiationtherapy
79問 • 1年前computed tomography 2
computed tomography 2
Kenneth Manlapaz · 11問 · 1年前computed tomography 2
computed tomography 2
11問 • 1年前radiotherapy
radiotherapy
Kenneth Manlapaz · 19問 · 1年前radiotherapy
radiotherapy
19問 • 1年前POSI 2
POSI 2
Kenneth Manlapaz · 30問 · 1年前POSI 2
POSI 2
30問 • 1年前問題一覧
1
•AKA Light Beam Diaphragm (LBD)
"It provides the radiographer with an easy to use accurate method of controlling the size of the X-ray field and placing it over the area of interest, thus reducing the radiation dose to the patient and improving the quality of the image.
•It is vulnerable to knocks often resulting in inaccuracy of the light beam/X-ray beam coincidence blown light bulbs, electrical and mechanical problems.
collimator
2
TRUE OR FALSE
COLLIMATOR
-Visual inspection
•Accuracy of scales
•Change a light bullo
•Light beam/x-ray beam alignment and centering
• Lead shutter efficiency
true
3
TRUE OR FALSE
VISUAL INSPECTION
-Rotation
- Stability
-Knobs for shutter control
-Accuracy of shutter setting scales (if present)
-Shutter chain drive
•Shutters
•Housing
-Window
-Light timer
-Timer switch
-Cables
-Plugs
-Light bulb
-Light/ x-ray beam alignment
true
4
Frequency of collimator
every 6 months
5
TRUE OR FALSE
Method collimators
-Set 100 cm focus to tabletop distance
-Using the 100cm FFD (SID) scale on the collimator, set various aperture sizes with the light on and measure the resultant light areas at table top level.
"Compare with settings on the collimator.
•Evaluation
•Light area measured should be the same as the setting on collimator
•Action
•If settings are not accurate and the solution is not a simple one, call an X-ray engineer
"File a report
true
6
Frequency of changing a light bulb
as necessary
7
Frequency of light beam or xray beam alignment test
6 months or as necessary
8
TRUE OR FALSE
LIGHT BEAM/X-RAY BEAM ALIGNMENT TEST
The purpose of the light in a collimator is to allow more accurate collimation of the X-ray beam. The light must, therefore, coincide with the X-ray beam. The light beam relies on the accurate positioning of the light bulb and angled mirror inside the collimator.
Frequency: every 6 months or as necessary
•Equipment required
One 24 x 30 cm loaded cassette.
Alignment test tool. Commercially made test tools are available, but a simple alternative is to use eight coins or four paper clips Lead marker or ninth coin
true
9
Closing the shutters in the collimator fully should prevent any radiation from reaching the film. Useful for testing radiation safety when discharging capacitor discharge mobiles or making tube warm up exposures.
-Frequency: every 6 months
•Equipment required: One loaded 24 x 30 cm cassette.
shutter efficiency test
10
Frequency of shutter efficiency test
every 6 months
11
Frequency of cassette inspection
yearly or as necessary
12
Method of cassette inspection
hinges,catches,casing,cleanliness
13
Frequency of light leakage test
yearly or as necessary
14
Frequency intensifying screen inspection
monthly
15
Frequency of film or screen contact test
yearly or as necessary
16
The purpose of the _________ is to reduce the amount of scattered radiation reaching the film. This greatly improves the quality of the image
A _________ looks like a simple thin sheet of soft metal, but it is in fact a precision made piece of equipment and easily damaged
It is made up of a large number of fine lead ships interspaced between radiolucent strips.
If the lead strips become distorted the grid will be less efficient and irregular densities will be created on the film.
grid
17
Types of grid
stationary,moving,parallel line
18
• A loose grid which can be placed directly over the face of the cassette.
• The grid and cassette size must be the same.
• The grid ratio is usually 6: 1 or 8: 1.
• Cassettes are available with a built in, or added, grid.
stationary grid
19
• Two sets of lead strips superimposed and running at 90 degrees to one another.
• Generally a stationary grid, used only for relatively high kV work and when no tube angulation is necessary.
• This design is used only in stationary grids.
cross hatch
20
• A grid used in a potter bucky system, which moves from side to side during the X-ray exposure, in order to defuse out the images of the lead strips.
• The grid ratio is usually 10: 1 or 12: 1.
• The grid ratio should be 16: 1 if used for high kV work.
moving grid
21
Moving grid ratio usually
10:1 or 12:1
22
Stationary grid ratio usually
6:1 or 8:1
23
• Lead strips run parallel to one another in one direction only.
• There are two types of parallel line grid, focused and non-focused.
• Moving and stationary grids are all of parallel construction.
parallel line grids
24
• A parallel line grid.
• Relationship of lead strips uniform to one another throughout.
non focused
25
• A parallel line grid.
• Differs from the non focused grid only in that the lead strips progressively incline more inward, the further they are from the centre line, so that they are focused to a predetermined point above the grid.
focused
26
The ratio of the height of the lead strips to the distance between them.
grid ratio
27
The number of lead strips in a grid. Stated as the number of lead strips to the centimetre (or to the inch).
grid line
28
Grids are designed to be used within given focus film distances {source image distances} dependent on the way the lead strips have been focused.
focal range
29
The direction in which the grid lines travel is indicated by a line down the center of the grid on the tube side.
Crosshatch grids have a second line running at _______ to the first.
90 degrees
30
Frequency of grid damage test
6 months or as necessary
31
A viewing box, or light box, is a simple but important aid to viewing radiographs and is commonly used throughout X-ray departments.
It consists of an even light source of sufficient light intensity to allow optimum viewing.
Viewing a radiograph under good viewing conditions is important in order to visualise the maximum amount of information.
viewing box or negatoscope
32
Frequency of Visual inspection of positioning pads
weekly or as necessary
33
Frequency of positioning pad test in xray
6 months or as necessary