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Imaging Applications and Quality > Lab 1 > Flashcards

Lab 1 Flashcards

1
Q

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

A

All the above

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2
Q

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

A

Daily

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3
Q

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

A

Daily

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4
Q

What equipment should be included in a visual inspection?

A
  1. Control console,
  2. overhead tube crane,
  3. radiographic table,
  4. protective lead apparel and
  5. miscellaneous equipment.
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5
Q

How often should a documented visual inspection take place?

A

Should be performed at least annually

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6
Q

T/F

Visual inspection should also be conducted of all other components of the imaging systems.

A

True

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7
Q

What is the purpose of a visual inspection of the x ray source?

A

Should be checked for motion or vibration during operation.

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8
Q

What is the objective of a visual inspection?

A

To ensure the components in an x-ray room are present and functioning according to acceptable parameters

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9
Q

What equipment is needed for a visual inspection?

A
  1. Visual Inspection log
  2. Tape measure or ruler
  3. Protractor & Image Receptor
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10
Q

What is the best method of using exposure factors to reduce patient dose?

A

Selection of highest kVp (and lowest mAs)

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11
Q

What is the objective of Radiographic tube voltage (kV) accuracy testing?

A

To verify that kVp stated on the control panel produces an x-ray beam with consistent amount of energy.

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12
Q

What equipment is needed for a Radiographic tube voltage (kV) accuracy test?

A
  1. X-ray unit
  2. Digital kVp meter
  3. Calculator
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13
Q

How do you find Percent Variance for Radiographic tube voltage (kV) accuracy testing?

A
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14
Q

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%

A

±8%

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15
Q

How often does HARP require patient entrance exposure and HVL testing to be preformed?

A

Every 6 months

(kVp accuracy should be performed first).

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16
Q

How often is, kVp accuracy testing preformed in medical facitilites Ontario?

A

Semi annually

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17
Q

T/F

The HARP Act does not explicitly state the frequency at which kVp accuracy must be tested

A

True

18
Q

As per SC35, the X-ray tube voltage must not deviate from the selected value by:
±5%
±8%
±10%
±15%

A

±10%

19
Q

As per SC35, the X-ray tube voltage accuracy must be tested:

Monthly
Quarterly
Semi-Annually
Annually

A

Annually

20
Q

What does the light field-radiation field congruence value measure?

A

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)

21
Q

How many sets of lead shutters are there in the collimator

A

2 sets of lead shutters

22
Q

Where is the small light bulb located in a collimator?

A

On the outer edge

23
Q

What is the purpose of the radiolucent mirror in the collimator?

A

To reflect the light from the bulb through the shutter opening.

24
Q

Where is the radiolucent mirror in the collimator located?

A

In the center of the collimator

25
Q

What is the objective of a Light field – X-ray field Congruency test?

A

To test light field – x-ray field congruency.

26
Q

What equipment is needed for a Light field – X-ray field Congruency test?

A

Measuring Tape
X-ay unit & Detector
Collimation Test Tool

27
Q

What piece of equipment is this?

A

A Collimator Test Tool

28
Q

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.

A

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.

29
Q

What is the equation to find the Light field – X-ray field Congruency percentage deviation?

A

X + X’ + Y + Y’ ≤ 2% of SID

30
Q

As per SC35, the X-ray field and light field alignment must be tested:

Monthly
Quarterly
Semi-Annually
Annually

A

Annually

31
Q

If the x-ray beam is not perpendicular to the image receptor, what may occur?

A

The image may be distorted or result in image cut off.

32
Q

What is the cause of X-ray beam Perpendicularity un-alignment?

A

-Heat that can breakdown the rubber rings that support the x-ray tube over time
-Rough handling

33
Q

What is the objective of X-ray beam Perpendicularity (Alignment) testing?

A

To assess x-ray beam alignment

34
Q

What materials are needed for X-ray beam Perpendicularity (Alignment) testing?

A

X-ay unit & Detector
Collimation Test Tool
Beam Alignment Test Tool

35
Q

What test is usually carried out along with the test for X-ray beam Perpendicularity (Alignment) testing?

A

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)

36
Q
A
37
Q

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 ____◦?

A

.5 of the perpendicular

38
Q

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.

A

The central ray lies within 1.5◦ from the perpendicular.

39
Q

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.

A

1.5◦ – 3◦ from the perpendicular.

40
Q

What degree value is acceptable for beam alignment?

A

1.5◦

Imaging Applications and Quality (9 decks)

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