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Radiation Safety CT

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This PPT will be available on the website. CT Regulations Review. General X-Ray Machine Regulations, HFS 157.74-86. 74 Administrative requirements ... – PowerPoint PPT presentation

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Title: Radiation Safety CT


1
Radiation Safety CT
  • Marc Martz
  • 955-4410
  • mmartz_at_mcw.edu

2
Radiation Safety Website
  • http//intranet.fchhome.com/Froedtert/Areas/Radiat
    ionSafety/
  • Forms
  • Film badge application
  • Pregnancy declaration form
  • Training Information
  • This PPT will be available on the website

3
CT Regulations Review
  • General X-Ray Machine Regulations, HFS 157.74-86
  • 74 Administrative requirements
  • 75 General requirements for all diagnostic x-ray
    systems
  • 80 Computed tomography x-ray systems

4
Radiation Dose Limits
5
Changing the Badge
  • Open the plastic holder, take out the old film
    packet and insert the new packet.
  • Make sure your name is clearly visible through
    the window.

6
Badge Holder
  • The plastic holder contains a system of filters
    to enable the dosimetry reader to determine the
    type of radiation the badge was exposed to, and
    under what circumstances.

7
Wearing the Dosimeter Correctly
  • The dosimeter must be worn at the collar level
    OUTSIDE the protective apron.

8
Double Badges
  • Staff performing interventional fluoroscopy or
    pregnant staff will be assigned a second
    dosimeter.
  • The second badge is to be worn at the waist,
    UNDER the protective apron.
  • The badge holders will be color-coded, do not
    switch badges.

Please review the policy Embryo/Fetus
Exposure Monitoring, available on the Radiation
Safety website.
9
Care of Your Badge
  • Film is damaged by heat, water, light and
    radiation.
  • When not in use, store your badge in a cool, dry
    place, away from any sources of radiation.

A good place to store your badge when not wearing
it a badge rack outside the x-ray suite.
10
Lost or Damaged Badges
  • Report any of the following IMMEDIATELY to
    Radiation Safety
  • Lost dosimeters.
  • Damaged dosimeters.
  • Dosimeters that have received a high dose of
    radiation.

11
ALARA Dose Levels
  • To help maintain radiation doses ALARA, the
    Radiation Safety Office has set two dose Action
    Levels.
  • ALARA Level 1 125 mrem/calendar quarter.
  • ALARA Level 2 375 mrem/calendar quarter.

12
ALARA Level 1
  • Level 1 is set at 10 of the annual limit, or 125
    mrem per quarter. Technically, only those who
    receive a dose above Level 1 are required to wear
    a film badge.
  • A report is made to the FMLH/MCW Radiation Safety
    Committee of all doses exceeding the Level 1
    threshold.

13
ALARA Level 2
  • Level 2 is set at 30 of the annual dose limit,
    or 375 mrem per quarter.
  • Radiation Safety investigates all exposures
    exceeding Level 2, makes any appropriate dose
    level reduction recommendations, and reports to
    the Radiation Safety Committee.

14
What Dose Did You Receive?
  • Under normal circumstances, Radiation Safety will
    report to you only if your annual dose exceeds
    500 millirem. If you do not receive an annual
    report, your dose is below 500 mrem.
  • You may contact Radiation Safety at any time if
    you wish to learn the results of film badge
    monitoring.

15
CT Shielding
1.3 µGy/sec 0.13 mrem/sec 4 mrem for a 30
second scan at the outer isodose boundary. Dont
stand in an open doorway during scanning!
16
Guess how this happened?
17
Hot Topics CT Dose
18
Brenner Hall, NEJM
  • A conventional anteriorposterior abdominal
    x-ray examination results in a dose to the
    stomach of approximately 0.25 mGy, which is at
    least 50 times smaller than the corresponding
    stomach dose from an abdominal CT scan.
  • It has been estimated that about 0.4 of all
    cancers in the United States may be attributable
    to the radiation from CT studies.

19
Risk from Medical Radiation
  • Risk vs. Benefit
  • Yes, there is a risk…but is it 0.4?
  • Calculated based on 1945 Japanese bomb survivors.
  • No published data on actual CT patient risk (one
    study currently underway).
  • Compare to risk of NOT having the CT exam.
  • CT screening not recommended.
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