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RT Journal Article
SR Electronic
T1 Effect of a Prescan Patient-Radiologist Encounter on Functional MR Image Quality
JF American Journal of Neuroradiology
JO Am. J. Neuroradiol.
FD American Society of Neuroradiology
SP 210
OP 215
DO 10.3174/ajnr.A2220
VO 32
IS 1
A1 Mahmoud, S.Y.
A1 Ahmed, M.
A1 Emch, T.M.
A1 Masood, P.
A1 Moon, D.
A1 Phillips, M.D.
A1 Ruggieri, P.M.
A1 Smith, A.S.
A1 Stultz, T.W.
A1 Tievsky, A.L.
A1 Jones, S.E.
YR 2011
UL http://www.ajnr.org/content/32/1/210.abstract
AB BACKGROUND AND PURPOSE: A substantial number of clinical fMRI examinations inadequately assess language localization or lateralization, usually due to patient movement and suboptimal participation. We hypothesized that a prescan interview of the patient by the radiologist would reduce the fraction of nondiagnostic scans. MATERIALS AND METHODS: A single noise score for each acquisition was produced from time-series data on the basis of a weighted sum of 22 factors. Scores were recorded as the following quartiles: 0–5 = excellent, 5–10 = adequate, 10–15= marginal, and &gt;15 = unacceptable. This measure was evaluated for 202 consecutive fMRI patients: 96 without and 106 with a physician prescan interview. The data were analyzed to compute the fraction of all nondiagnostic sequences and entire studies and were compared between the 2 groups. Image-noise characteristics included the SDs of linear and angular displacements of the head and the number of time-series outliers caused by focal motion. RESULTS: Of 999 sequences acquired, 539 had a prescan interview. The mean noise score significantly decreased for both individual sequence (from 7.9 to 6.3, P = &lt;.001) and study-based (from 7.7 to 6.2, P = .05) methods. The fraction of sequences or studies scored as unacceptable decreased for sequence-based (from 15.2% to 10.9%, P = .04) and study-based (from 9.4% to 1.9%, P = .02) analyses. SDs of head motion decreased for linear (by 12%–14%, P &lt; .01) and angular displacement (by 38%–48%, P &lt; .001). The number of time-series spikes decreased by 10% (P = .004). CONCLUSIONS: We report that a prescan physician-patient interview modestly but significantly reduces fMRI noise scores. These results support the newly added billable costs of professional intervention before fMRI scans. CPTCurrent Procedural TerminologyfMRIfunctional MR imaging