Radiation risk from medical imaging: Difference between revisions

(Text replacement - "*CXR" to "*CXR")
(Revised radiation exposure list)
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==Tests and Radiation Amounts==
==Tests and Radiation Amounts==
===Plain Film X-ray (mrad)===
                                                                                                               
'''Low-dose'''
{| border="1"
*Head <1
|-
*C-spine <1
!Procedure
*Thracic spine <1
!Radiation Dose (mSv)
*[[CXR]] <1
!Additional Cancer Risk
*Extrem <1
!
|-
!
!
!Male
!Female
|-
|'''Comparison Doses'''
|
|
|
|-
|Average US Esposure
|6.2 mSv/year
|
|
|-
|7-hour Airline Flight
|0.02
|
|
|-
|'''Plain Radiograph'''
|
|
|
|-
|Chest x-ray (2-views)
|0.1
|1 in 197628
|1 in 147929
|-
|Pelvis x-ray
|0.6
|1 in 32960
|1 in 24655
|-
|Neck x-ray
|0.2
|1 in 98912
|1 in 73964
|-
|L-spine x-ray
|1.5
|1 in 13184
|1 in 9863
|-
|Extremity x-ray
|0.001
|1 in 20000000
|1 in 14285714
|-
|'''Computed Tomography'''
|
|
|
|-
|CT head
|2
|1 in 9887
|1 in 7397
|-
|CT neck
|6
|1 in 3296
|1 in 2466
|-
|CT L-spine
|5.6
|1 in 3531
|1 in 2642
|-
|CT Pulmonary Angiography
|15
|1 in 1318
|1 in 986
|-
|CT Abdomen, Pelvis
|14
|1 in 1413
|1 in 1057
|-
|CT Chest, Abdomen, Pelvis
|21
|1 in 942
|1 in 704
|}


'''High-dose'''
==== More Information ====
*L-spine <1250
*Data from: http://www.xrayrisk.com/, additional cancer risk based on estimated 50 year-old male/female.
*Pelvis <350
*How information is calculated: http://www.xrayrisk.com/about.php/
*Hip <450
*IVP <900
*Urethrocyst <1500
*KUB <500
===CT (1cm slices)===
*Head <50
*Chest <1000
*Upper abdomen <3000
*Lower abdomen <9000
 
===Angiography===
*Cerebral <100
*Cardiac cath <500
*Aortography <100
 
===V/Q scan <215===
*(class C injectable technetium, xenon even safer)


==Pregnancy==
==Pregnancy==

Revision as of 02:28, 15 January 2017

Tests and Radiation Amounts

Procedure Radiation Dose (mSv) Additional Cancer Risk
Male Female
Comparison Doses
Average US Esposure 6.2 mSv/year
7-hour Airline Flight 0.02
Plain Radiograph
Chest x-ray (2-views) 0.1 1 in 197628 1 in 147929
Pelvis x-ray 0.6 1 in 32960 1 in 24655
Neck x-ray 0.2 1 in 98912 1 in 73964
L-spine x-ray 1.5 1 in 13184 1 in 9863
Extremity x-ray 0.001 1 in 20000000 1 in 14285714
Computed Tomography
CT head 2 1 in 9887 1 in 7397
CT neck 6 1 in 3296 1 in 2466
CT L-spine 5.6 1 in 3531 1 in 2642
CT Pulmonary Angiography 15 1 in 1318 1 in 986
CT Abdomen, Pelvis 14 1 in 1413 1 in 1057
CT Chest, Abdomen, Pelvis 21 1 in 942 1 in 704

More Information

Pregnancy

  • Greatest risk of harm during organogenesis (3-8 WGA)
  • IV contrast not teratogenic (class B)
  • PO contrast not absorbed = no risk

Exposure Risk

  • <5,000 mrads = safe
  • ~10,000 mrads = small risk childhood CA
  • ~15,000^ mrads = 6% chance mental retardation
  • <3% chance childhood CA

^Considered max

Always use shield when possible

See Also

References

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