Lab 1 Flashcards
Safety Code 35 specifies quality control procedures for
1. film based systems
2. CR systems
3. DR systems
4. All the above
5. Only 2 & 3
All the above
As per Safety Code 35, at what frequency must equipment warm up be performed on DR systems?
-Daily
-Hourly
-Prior to every exposure
-All the above
-1 & 3 only
Daily
As per Safety Code 35, at what frequency must X-ray equipment be visually inspected for loose components and cleanliness?
-Daily
-Weekly
-Prior to every exposure
-All the above
-1 & 3 only
Daily
What equipment should be included in a visual inspection?
- Control console,
- overhead tube crane,
- radiographic table,
- protective lead apparel and
- miscellaneous equipment.
How often should a documented visual inspection take place?
Should be performed at least annually
T/F
Visual inspection should also be conducted of all other components of the imaging systems.
True
What is the objective of a visual inspection?
To ensure the components in an x-ray room are present and functioning according to acceptable parameters
What equipment is needed for a visual inspection?
- Visual Inspection log
- Tape measure or ruler
- Protractor & Image Receptor
What is the best method of using exposure factors to reduce patient dose?
Selection of highest kVp (and lowest mAs)
What is the objective of Radiographic tube voltage (kV) accuracy testing?
To verify that kVp stated on the control panel produces an x-ray beam with consistent amount of energy.
What equipment is needed for a Radiographic tube voltage (kV) accuracy test?
- X-ray unit
- Digital kVp meter
- Calculator
As per the HARP Act, for any selected setting of the peak x-ray tube potential over the normal range of use of the machine, the average peak kilovoltage must correspond to the selected value to within:
1. ±5%
2. ±8%
3. ±10%
4. ±15%
±8%
How often does HARP require patient entrance exposure and HVL testing to be preformed?
Every 6 months
(kVp accuracy should be performed first).
How often is, kVp accuracy testing preformed in medical facitilites Ontario?
Semi annually
T/F
The HARP Act does not explicitly state the frequency at which kVp accuracy must be tested
True
As per SC35, the X-ray tube voltage must not deviate from the selected value by:
±5%
±8%
±10%
±15%
±10%
As per SC35, the X-ray tube voltage accuracy must be tested:
Monthly
Quarterly
Semi-Annually
Annually
Annually
What does the light field-radiation field congruence value measure?
How well the collimator regulates the beam size and whether the area illuminated by the positioning light and the area exposed by the x-rays are the same.
(Measuring how well the collimator regulates your beam)
How many sets of lead shutters are there in the collimator
2 sets of lead shutters
Where is the small light bulb located in a collimator?
On the outer edge
What is the purpose of the radiolucent mirror in the collimator?
To reflect the light from the bulb through the shutter opening.
Where is the radiolucent mirror in the collimator located?
In the center of the collimator
What equipment is needed for a Light field – X-ray field Congruency test?
Measuring Tape
X-ay unit & Detector
Collimation Test Tool
What piece of equipment is this?
A Collimator Test Tool
T/F
As per SC 35 and the HARP act, the visually defined field with the edges of the X-ray field must not exceed 10% of the focal spot to image receptor distance.
False; As per SC 35 and the HARP act, the visually defined field with the edges of the X-ray field must not exceed 2% of the focal spot to image receptor distance.
As per SC35, the X-ray field and light field alignment must be tested:
Monthly
Quarterly
Semi-Annually
Annually
Annually
If the x-ray beam is not perpendicular to the image receptor, what may occur?
The image may be distorted or result in image cut off.
What is the cause of X-ray beam Perpendicularity un-alignment?
-Heat that can breakdown the rubber rings that support the x-ray tube over time
-Rough handling
What materials are needed for X-ray beam Perpendicularity (Alignment) testing?
X-ay unit & Detector
Collimation Test Tool
Beam Alignment Test Tool
What test is usually carried out along with the test for X-ray beam Perpendicularity (Alignment) testing?
Beam alignment test
(The beam alignment test tool is kept on the collimator test-tool in such a way that the stainless-steel ball of the lower side of the tool is just above the center collimator test-tool)
If the images of the two steel balls overlap in an X-ray beam Perpendicularity alignment test, the central ray of the beam is within ____◦?
.5 of the perpendicular
If the image of the top ball falls within the image of the inner circle in an x ray beam perpendicularity alignment test, the central ray lies within ____◦ from the perpendicular.
The central ray lies within 1.5◦ from the perpendicular.
If the ball falls between the images of inner and outer circles in an x ray beam perpendicularity alignment test, the central ray is within ____◦ – ____◦ from the perpendicular.
1.5◦ – 3◦ from the perpendicular.
What degree value is acceptable for beam alignment?
1.5◦
