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Variant 1: Asymptomatic. Structural lesion on physical examination (cervical bruit) and/or risk factors.
Procedure Appropriateness Category SOE Adult RRL Peds RRL Rating Median Final Tabulations
1 2 3 4 5 6 7 8 9
US duplex Doppler carotid Usually appropriate O 0 mSv O 0 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
MRA neck without and with IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
MRA neck without IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
CTA neck with IV contrast Usually appropriate ☢☢☢ 1-10 mSv ☢☢☢ 0.3-3 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
MRI head perfusion with IV contrast May be appropriate O 0 mSv O 0 mSv [ped] 5 n/a 0 0 0 0 0 0 0 0 0
MRI head without and with IV contrast May be appropriate O 0 mSv O 0 mSv [ped] 5 n/a 0 0 0 0 0 0 0 0 0
MRI head without IV contrast May be appropriate O 0 mSv O 0 mSv [ped] 5 n/a 0 0 0 0 0 0 0 0 0
CT head perfusion with IV contrast May be appropriate ☢☢☢ 1-10 mSv 5 n/a 0 0 0 0 0 0 0 0 0
CT head without IV contrast May be appropriate ☢☢☢ 1-10 mSv ☢☢☢ 0.3-3 mSv [ped] 5 n/a 0 0 0 0 0 0 0 0 0
Arteriography cervicocerebral Usually not appropriate ☢☢☢ 1-10 mSv ☢☢☢☢ 3-10 mSv [ped] 2 n/a 0 0 0 0 0 0 0 0 0
MRA head without and with IV contrast Usually not appropriate O 0 mSv O 0 mSv [ped] 3 n/a 0 0 0 0 0 0 0 0 0
MRA head without IV contrast Usually not appropriate O 0 mSv O 0 mSv [ped] 3 n/a 0 0 0 0 0 0 0 0 0
CT head with IV contrast Usually not appropriate ☢☢☢ 1-10 mSv ☢☢☢ 0.3-3 mSv [ped] 3 n/a 0 0 0 0 0 0 0 0 0
CT head without and with IV contrast Usually not appropriate ☢☢☢ 1-10 mSv ☢☢☢☢ 3-10 mSv [ped] 3 n/a 0 0 0 0 0 0 0 0 0
CTA head with IV contrast Usually not appropriate ☢☢☢ 1-10 mSv ☢☢☢☢ 3-10 mSv [ped] 3 n/a 0 0 0 0 0 0 0 0 0
Variant 2: Carotid territory or vertebrobasilar TIA, initial screening survey.
Procedure Appropriateness Category SOE Adult RRL Peds RRL Rating Median Final Tabulations
1 2 3 4 5 6 7 8 9
MRA head and neck without and with IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
MRA head and neck without IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
MRI head without and with IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 9 n/a 0 0 0 0 0 0 0 0 0
MRI head without IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
CT head without IV contrast Usually appropriate ☢☢☢ 1-10 mSv ☢☢☢ 0.3-3 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
CTA head and neck with IV contrast Usually appropriate ☢☢☢ 1-10 mSv ☢☢☢☢ 3-10 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
US duplex Doppler carotid May be appropriate O 0 mSv O 0 mSv [ped] 5 n/a 0 0 0 0 0 0 0 0 0
MRI head perfusion with IV contrast May be appropriate O 0 mSv O 0 mSv [ped] 5 n/a 0 0 0 0 0 0 0 0 0
CT head perfusion with IV contrast May be appropriate ☢☢☢ 1-10 mSv 5 n/a 0 0 0 0 0 0 0 0 0
Arteriography cervicocerebral Usually not appropriate ☢☢☢ 1-10 mSv ☢☢☢☢ 3-10 mSv [ped] 3 n/a 0 0 0 0 0 0 0 0 0
Arteriography neck Usually not appropriate ☢☢☢ 1-10 mSv 3 n/a 0 0 0 0 0 0 0 0 0
CT head with IV contrast Usually not appropriate ☢☢☢ 1-10 mSv ☢☢☢ 0.3-3 mSv [ped] 3 n/a 0 0 0 0 0 0 0 0 0
CT head without and with IV contrast Usually not appropriate ☢☢☢ 1-10 mSv ☢☢☢☢ 3-10 mSv [ped] 3 n/a 0 0 0 0 0 0 0 0 0
Variant 3: New focal neurologic defect, fixed or worsening. Less than 6 hours. Suspected stroke.
Procedure Appropriateness Category SOE Adult RRL Peds RRL Rating Median Final Tabulations
1 2 3 4 5 6 7 8 9
MRA head and neck without and with IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
MRA head and neck without IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
MRI head without and with IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
MRI head without IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
CT head without IV contrast Usually appropriate ☢☢☢ 1-10 mSv ☢☢☢ 0.3-3 mSv [ped] 9 n/a 0 0 0 0 0 0 0 0 0
CTA head and neck with IV contrast Usually appropriate ☢☢☢ 1-10 mSv ☢☢☢☢ 3-10 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
Arteriography cervicocerebral May be appropriate ☢☢☢ 1-10 mSv ☢☢☢☢ 3-10 mSv [ped] 5 n/a 0 0 0 0 0 0 0 0 0
MRI head perfusion with IV contrast May be appropriate O 0 mSv O 0 mSv [ped] 5 n/a 0 0 0 0 0 0 0 0 0
CT head perfusion with IV contrast May be appropriate ☢☢☢ 1-10 mSv 6 n/a 0 0 0 0 0 0 0 0 0
US duplex Doppler carotid Usually not appropriate O 0 mSv O 0 mSv [ped] 2 n/a 0 0 0 0 0 0 0 0 0
CT head with IV contrast Usually not appropriate ☢☢☢ 1-10 mSv ☢☢☢ 0.3-3 mSv [ped] 3 n/a 0 0 0 0 0 0 0 0 0
CT head without and with IV contrast Usually not appropriate ☢☢☢ 1-10 mSv ☢☢☢☢ 3-10 mSv [ped] 3 n/a 0 0 0 0 0 0 0 0 0
Variant 4: New focal neurologic defect, fixed or worsening. Longer than 6 hours. Suspected stroke.
Procedure Appropriateness Category SOE Adult RRL Peds RRL Rating Median Final Tabulations
1 2 3 4 5 6 7 8 9
MRA head and neck without and with IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
MRA head and neck without IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
MRI head without and with IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
MRI head without IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
CT head without IV contrast Usually appropriate ☢☢☢ 1-10 mSv ☢☢☢ 0.3-3 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
CTA head and neck with IV contrast Usually appropriate ☢☢☢ 1-10 mSv ☢☢☢☢ 3-10 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
Arteriography cervicocerebral May be appropriate ☢☢☢ 1-10 mSv ☢☢☢☢ 3-10 mSv [ped] 6 n/a 0 0 0 0 0 0 0 0 0
MRI head perfusion with IV contrast May be appropriate O 0 mSv O 0 mSv [ped] 5 n/a 0 0 0 0 0 0 0 0 0
CT head perfusion with IV contrast May be appropriate ☢☢☢ 1-10 mSv 5 n/a 0 0 0 0 0 0 0 0 0
US duplex Doppler carotid Usually not appropriate O 0 mSv O 0 mSv [ped] 2 n/a 0 0 0 0 0 0 0 0 0
CT head with IV contrast Usually not appropriate ☢☢☢ 1-10 mSv ☢☢☢ 0.3-3 mSv [ped] 3 n/a 0 0 0 0 0 0 0 0 0
CT head without and with IV contrast Usually not appropriate ☢☢☢ 1-10 mSv ☢☢☢☢ 3-10 mSv [ped] 3 n/a 0 0 0 0 0 0 0 0 0
Variant 5: Proven parenchymal hemorrhage (hematoma).
Procedure Appropriateness Category SOE Adult RRL Peds RRL Rating Median Final Tabulations
1 2 3 4 5 6 7 8 9
MRA head without and with IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
MRA head without IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
MRI head without and with IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 9 n/a 0 0 0 0 0 0 0 0 0
MRI head without IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
MRV head without and with IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 7 n/a 0 0 0 0 0 0 0 0 0
MRV head without IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 7 n/a 0 0 0 0 0 0 0 0 0
CT head without IV contrast Usually appropriate ☢☢☢ 1-10 mSv ☢☢☢ 0.3-3 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
CTA head with IV contrast Usually appropriate ☢☢☢ 1-10 mSv ☢☢☢☢ 3-10 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
CTV head with IV contrast Usually appropriate ☢☢☢ 1-10 mSv ☢☢☢☢ 3-10 mSv [ped] 7 n/a 0 0 0 0 0 0 0 0 0
Arteriography cervicocerebral May be appropriate ☢☢☢ 1-10 mSv ☢☢☢☢ 3-10 mSv [ped] 6 n/a 0 0 0 0 0 0 0 0 0
MRA head and neck without and with IV contrast May be appropriate O 0 mSv O 0 mSv [ped] 6 n/a 0 0 0 0 0 0 0 0 0
MRA head and neck without IV contrast May be appropriate O 0 mSv O 0 mSv [ped] 5 n/a 0 0 0 0 0 0 0 0 0
CT head with IV contrast May be appropriate ☢☢☢ 1-10 mSv ☢☢☢ 0.3-3 mSv [ped] 4 n/a 0 0 0 0 0 0 0 0 0
CT head without and with IV contrast May be appropriate ☢☢☢ 1-10 mSv ☢☢☢☢ 3-10 mSv [ped] 6 n/a 0 0 0 0 0 0 0 0 0
CTA head and neck with IV contrast May be appropriate ☢☢☢ 1-10 mSv ☢☢☢☢ 3-10 mSv [ped] 5 n/a 0 0 0 0 0 0 0 0 0
CTV head and neck with IV contrast May be appropriate ☢☢☢ 1-10 mSv 5 n/a 0 0 0 0 0 0 0 0 0
Variant 6: Suspected dural venous sinus thrombosis.
Procedure Appropriateness Category SOE Adult RRL Peds RRL Rating Median Final Tabulations
1 2 3 4 5 6 7 8 9
MRI head without and with IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 7 n/a 0 0 0 0 0 0 0 0 0
MRI head without IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 7 n/a 0 0 0 0 0 0 0 0 0
MRV head and neck without and with IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
MRV head without and with IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 9 n/a 0 0 0 0 0 0 0 0 0
MRV head without IV contrast Usually appropriate O 0 mSv O 0 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
CT head without and with IV contrast Usually appropriate ☢☢☢ 1-10 mSv ☢☢☢☢ 3-10 mSv [ped] 7 n/a 0 0 0 0 0 0 0 0 0
CT head without IV contrast Usually appropriate ☢☢☢ 1-10 mSv ☢☢☢ 0.3-3 mSv [ped] 7 n/a 0 0 0 0 0 0 0 0 0
CTV head and neck with IV contrast Usually appropriate ☢☢☢ 1-10 mSv 7 n/a 0 0 0 0 0 0 0 0 0
CTV head with IV contrast Usually appropriate ☢☢☢ 1-10 mSv ☢☢☢☢ 3-10 mSv [ped] 8 n/a 0 0 0 0 0 0 0 0 0
Catheter venography cervicocerebral May be appropriate ☢☢☢ 1-10 mSv 5 n/a 0 0 0 0 0 0 0 0 0
MRV head and neck without IV contrast May be appropriate O 0 mSv O 0 mSv [ped] 6 n/a 0 0 0 0 0 0 0 0 0
CT head with IV contrast May be appropriate ☢☢☢ 1-10 mSv ☢☢☢ 0.3-3 mSv [ped] 6 n/a 0 0 0 0 0 0 0 0 0
Appendix Key

A more complete discussion of the items presented below can be found by accessing the supporting documents at the designated hyperlinks.

Appropriateness Category:The panel’s recommendation for a procedure based on the assessment of the risks and benefits of performing the procedure for the specified clinical scenario.

SOE: Strength of Evidence. The assessment of the amount and quality of evidence found in the peer reviewed medical literature for an appropriateness recommendation.

  • References: The citation number and PMID for the reference(s) associated with the recommendation.
  • Study Quality: The assessment of the quality of an individual reference based on the number of study quality elements described in the reference.

RRL: Relative Radiation Level. A population based assessment of the amount of radiation a typical patient may be exposed to during the specified procedure.

Rating: The final rating (1-9 scale) for the procedure as determined by the panel during rating rounds.

Median: The median rating (1-9 scale) for the procedure as determined by the panel during rating rounds.

Final tabulations: A histogram showing the number of panel members who rated the procedure as noted in the column heading (ie, 1, 2, 3, etc.).

Additional supporting documents about the AC methodology and processes can be found at www.acr.org/ac.