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BD Study Guide > Module 14 > Flashcards

Module 14 Flashcards

1
Q

What filter do GE lunar systems use

A

Cerium

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2
Q

The cerium filter spectrum at 80KV produces 2 photo electric peaks at about what value

A

40keV and 70keV

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3
Q

Norland Swissray uses what type of filter

A

Samarium

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4
Q

The Samarium filter spectrum at 100kV a low energy peak and high energy peak at what range

A

47keV low, Less than 100keV high

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5
Q

Hologic scanners use what type of filter system

A

Energy switching xray beam between 100 and 140kVp

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6
Q

Two dimensional scan area is also known as

A

Projectional or areal

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7
Q

Three dimensional scans are also known as

A

Volumetric

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8
Q

A decrease in the BMC also results in a decrease in

A

BMD

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9
Q

A decrease in area causes an increase in

A

BMD

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10
Q

This is the sum of the data values, divided by the number of values

A

Mean

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11
Q

Measure of variability, it shows how spread out the data is around the mean

A

Standard deviation

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12
Q

This is A statistic that helps compare a variability between different datasets whether or not they have the same mean

A

Percent coefficient of variation

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13
Q

This refers to an inconvenient anomaly in which T scores from different atomic sites within the same patient fall into different diagnostic classifications

A

Discordance

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14
Q

This describes how closely a measurement approximates with things that is measuring

A

Accuracy

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15
Q

This measures how closely a test`s results approximate the correct value

A

Trueness

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16
Q

This is the measure of how likely a test is to achieve the same result when repeated on the same subject in the same conditions

A

Precision

17
Q

This is used to describe the consistency of measurement

A

Precision

18
Q

This is used to describe how closely it measures the expected values

A

Trueness

19
Q

What are the rules for in vivo scans

A

Either 15 patients 3 times each or 30 patients 2 times each

20
Q

What is the maximum acceptable precision error for technologies performing a lumbar spine scan

A

1.9% with an associated LSC of 5.3%

21
Q

What is the maximum precision error for a scan of the total hip

A

1.8% with an LSC of 5%

22
Q

What is the maximum precision error for a scan of the femoral neck

A

2.5% with an LSC of 6.9%

23
Q

How do you cross calibrate machines

A

Scan 30 patients representative of the facility’s patient population on the original system and then twice on the new system for this method all scan should be completed within 60 days

24
Q

This is a measure of bone micro texture and is a marker for the risk of osteoprosis

A

Trabecular bone score

25
Q

What does QC on DXA units consist of

A

Scanner calibration test, Phantom test, and precision assessments

26
Q

This is a comprehensive program that sets guidelines for monitoring and evaluating medical systems. This includes the scanner’s function and the technologies technique

A

QA, quality assurance

27
Q

When values are plotted mathematical rules are applied to detect any failures that indicate a change in a machine’s performance the result of this QC is called what

A

Shewhart or control chart

28
Q

This is a statistical method of Quality control, the purpose of this is to evaluate scanner stability

A

Shewhart rules

29
Q

The upper lower controls on control chart represent plus and minus ____ percent of the main

A

1.5

30
Q

What type of Phantom does a hologic unit use

A

Anthropomorphic (made of hydroxyapatite)

31
Q

What type of spine Phantom does GE use

A

Aluminum

32
Q

What are the 3 basic statistical terms used in analysis of QC results

A

The mean, the standard deviation, and the percent coefficient variation

33
Q

Precision assessment measures

A

Reproducibility

34
Q

True or false DXA scanning exposes patients to < one day’s worth of natural background radiation

A

True

35
Q

Which skeletal site offers the highest precision in the most rapid response treatment

A

Lumbar spine

36
Q

When should cross calibration be performed

A

When changing DXA hardware

37
Q

How many Phantom scans must be performed to verify Phantom BMD following scanner maintenance

A

10

38
Q

Serial scanning of a patient’s bone mineral density values can be used to monitor

A

Response to therapy

39
Q

What is the main purpose of Shewhart rules as they apply to bone Densitometry

A

Evaluating scanner precision

BD Study Guide (15 decks)

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