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Contrast-to-Noise

By Roger Duncan,2014-08-30 02:07
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Contrast-to-Noise

附件八之二_ GE Senographe 2000D(範例)

    醫院! 檢查人員簽名! 覆核人員簽名! TEST RESULTS RECORD FORMS

Daily and Weekly Tests

    Facility : ………………………………… ROOM: ……………………………………..

     Year Month

    Date 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

     Initials

    Monitor cleaning (daily)

    Seno

    Advantage Viewing

    Conditions Flat Field test (daily) (weekly)

    Image Quality test (weekly)

    Viewing Con- ditions (weekly)

     Year Month

     Date 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

     Initials

    Monitor cleaning (daily)

    Seno

    Advantage Viewing

    Conditions Flat Field test (daily) (weekly)

    Image Quality test(weekly)

    Viewing Con- ditions (weekly)

    Remarks:

Action Limit:

    If the reading room configuration has changed, the source of the problem must be identified,

    and corrective action taken, before any further mammographic images are reviewed or

    interpreted using the Seno Advantage.

     1

附件八之二_ GE Senographe 2000D(範例)

    醫院! 檢查人員簽名! 覆核人員簽名!

    Image Quality Test Record

use this form to record the results of Flat Field, Phantom Image Quality and CNR

    Measurement tests:

     Year

     Month

     Date

     Initials

    Flat Field Test object used:

     Brightness non-uniformity

    High frequency

    modulation Bad pixel verification

     Bad ROI

     SNR non-uniformity

    Phantom Image Quality Phantom Used: AWS:

     Zoom

     Window Width (WW)

     Window Level (WL)

     No. of fibers

     No. of specks groups

     No. of masses

    Printer:

     No. of fibers

     No. of speck groups

     No. of masses

    Contrast-to-Noise Ratio (CNR)

    Change in CNR

    Flat Field Test Result :

     LSL: N/A USL

     Brightness non-uniformity

    High frequency modulation

     Bad pixel verification

     Bad ROI

    SNR non-uniformity 2

    附件八之二_ GE Senographe 2000D(範例) 醫院! 檢查人員簽名! 覆核人員簽名!

Image Quality Test Record

    Determination of Operating Level CNR

     Date CNR Date CNR Date CNR

     Day 1

     Day 2

     Day 3

     Day 4

     Day 5

     CNR ol

    CNR(Operating Level CNR) = Average of 5 CNR values, one acquired on each of five ol

     consecutive days.

     Notes:

    以下情形必須重新建立CNR ol

    1.更換X 光球管。

    2.更換Mo濾片。

    3.更換壓迫板。

    4.更換假體。

    5.更換鉛柵。

    6.更換detector

    7.detector增益值進行再校正。

    3

    附件八之二_ GE Senographe 2000D(範例) 醫院! 檢查人員簽名! 覆核人員簽名!

Image Quality Test Record

Frequency: Weekly

     Year

     Month

     Date

     Initials

    Phantom Image Quality Phantom Used:

    Senoadvantage Left Monitor:

     Zoom

     Window Width (WW)

     Window Level (WL)

     No. of fibers

     No. of specks groups

     No. of masses

    Phantom Image Quality Phantom Used:

    Senoadvantage Right Monitor:

     Zoom

     Window Width (WW)

     Window Level (WL)

     No. of fibers

     No. of specks groups

     No. of masses

     Notes:

    4

附件八之二_ GE Senographe 2000D(範例)

    醫院! 檢查人員簽名! 覆核人員簽名!

    MTF Measurement and AOP Mode and SNR Check Records

Frequency: Monthly

    Room: ………………………………. Unit: …………………………………

     Year Month

     Date

     Initials

    MTF measurement: Bar pattern used :

     MTF 2 lp/mm

     MTF 4 lp/mm

    AOP Mode Check; mAs or F/n. See Guidance section 5 AOP Mode and SNR Check, page 101 regarding a method to record these results.

    25 mm acrylic

    40 mm acrylic

    60 mm acrylic AOP Mode Check, SNR value

    25 mm acrylic

    40 mm acrylic

    60 mm acrylic

測試標準 :

    (1) MTF > 58%以及MTF > 25% 2 lp/mm4 lp/mm

    (2) SNR as mean/sd: SNR值必須超過50

    (3) AOP Mode測試必須符合以下結果 :

    Table by :5195687-1-1EN Revision 1 Copyright? 2007 by General Electric Company Inc.

    5

附件八之二_ GE Senographe 2000D(範例)

    醫院! 檢查人員簽名! 覆核人員簽名!

Notes:

MONITOR CALIBRATION CHECK

Frequency: Monthly

Room: ……………………………….. Unit: ………………………………

    Date

    Month

    Initials

    Monitor Left (pass/Fail) Right (pass/Fail)

    0%-5% contrast

    95%-100% contrast

    Gray steps

    Alphanumerics

    line-pair images (center)

    line-pair images (corners)

• Action Limit:

    a. The 0%-5% contrast and the 95%-100% contrast shall be visible.

    b. Each step from 0% to 100% shall be distinguishable from the adjacent ones. c. The alphanumeric characters shall appear sharply focused.

    d. The high-contrast line-pair patterns representing 3-pixels-on/3-pixels-off and 2-pixels-on/2-pixelsoff must be distinguishable at the center and the corners of the display for both the horizontal and vertical orientations of the line-pair patterns. The high-contrast line-pair patterns representing 1- pixel-on/1-pixel-off must be distinguishable at the center and the corners of the display for the horizontal orientation of the patterns. Failure to distinguish the 1-pixel-on/1-pixel-off, high-contrast, vertical line-pair patterns does not constitute failure of the test.

• Use of the Test Results:

    The ability to distinguish the low-contrast line-pair patterns is not a requirement for this test. If these conditions are maintained, the monitors are considered correctly calibrated. If the system fails the test, the source of the problem must be identified and corrective action

    6

附件八之二_ GE Senographe 2000D(範例)

    醫院! 檢查人員簽名! 覆核人員簽名! taken, before any further mammographic images are reviewed or interpreted using the Seno

    Advantage.

Visual Checklist Record

    Frequency: Monthly

    Room: ……………………………… Unit: ………………………………….

Year:

     Month

     Day

     Initials

    Gantry:

     Angulation Indicator

    Locks (all)

    Field Light

    Smoothness of motion

    Inspect all paddles for cracks

    Control Panel:

    Switches/indicators

     Display

     Technique charts

    Other:

    Cleaning fluid

    Pass: P

    Fail: F

    Does not Apply: N/A

    7

附件八之二_ GE Senographe 2000D(範例)

    醫院! 檢查人員簽名! 覆核人員簽名!

Record of Check

    Year Month

     Date

     Initials

    Visual Inspection

    Repeat Analysis

     Auto

     Compression:

    Manual

     Radiologist Review

     Physicist Review

     8

附件八之二_ GE Senographe 2000D(範例)

    醫院! 檢查人員簽名! 覆核人員簽名!

Repeat Exposure Record Sheet

    Use this chart to record all repeated exposures that caused the patient to receive additional dose beyond

    that of the normal exam.

Period covered:

     Dates From………………………. To ………………………….

    Study # Causes No. of Times Date Technologist

Causes: 1 Positioning 5 Incorrect Patient ID 9

附件八之二_ GE Senographe 2000D(範例)

    醫院! 檢查人員簽名! 覆核人員簽名!

     2 Patient Motion 6 X-ray Equipment Failure

     3 Exposure too low (noisy image) 7 Blank Image

     4 Exposure too high (image saturation) 8 Other

Repeat Exposure Analysis

    Use this chart to analyze all repeated exposures that caused the patient to receive additional dose beyond that of the normal exam.

Period covered:

     Dates From…………………….. To ……………………………

    No. of Repeat Percentage of repeats Cause Exposures by category

     1 Positioning

     2 Patient Motion

     3 Exposure too low (noisy image)

     4 Exposure too high (image saturation)

     5 Incorrect Patient ID

     6 X-ray Equipment Failure

     7 Blank Image

     8 Other

     Total of Repeat Exposures (R)

     Total of All Exposures (T)

    Repeat Exposure Percentage (R/T x 100)

     10

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