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Intermittent-Mode CT Fluoroscopy–guided Biopsy of the Lung or Upper Abdomen with Breath-hold Monitoring and Feedback: System Development and Feasibility¹

¹ From the Department of Radiology (S.K.C., J.P.F., C.E.B., R.L.E., H.H.H.), Section of Safety (K.L.C.), and Division of Biostatistics (T.L.H.), Mayo Clinic, 200 First St SW, Rochester, MN 55905. From the 2002 RSNA scientific assembly. Received November 20, 2002; revision requested January 13, 2003; revision received March 17; accepted April 2. Supported in part by the General Electric–Association of University Radiologists Radiology Research Fellowship Program. Address correspondence to S.K.C. (e-mail: scarlson@mayo.edu).

A bellows-based breath-hold monitoring and feedback system was developed and evaluated for use in intermittent-mode computed tomographic (CT) fluoroscopy–guided biopsy procedures in the lung or upper abdomen. The bellows system is described, and its feasibility is demonstrated in studies with a respiratory phantom and human volunteers. Results are reported for seven patients who underwent bellows-assisted biopsy. Breath-hold monitoring and feedback with the bellows system allow the patient to perform reliable breath holding at a preselected level. This optimizes intermittent-mode CT fluoroscopy–guided biopsies by allowing consistent visualization of the target lesion throughout the procedure.

© RSNA, 2003

Index terms: Computed tomography (CT), guidance, 60.12112 • Computed tomography (CT), technology, 60.12112 • Lung, biopsy, 60.12112 • Lung, CT, 60.12112

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