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TECHNICAL PAPERS: Soft Tissue

Design of an MRI-Compatible Robotic Stereotactic Device for Minimally Invasive Interventions in the Breast†

[+] Author and Article Information
Blake T. Larson, Arthur G. Erdman

Dept. of Mechanical Engineering, University of Minnesota, 111 Church Street SE, Minneapolis, MN 55455

Nikolaos V. Tsekos

Mallinckrodt Institute of Radiology, Washington University, 510 S Kingshighway Blvd, Campus Box 8225, St. Louis, MO 63110 e-mail: tsekosn@mir.wustl.edu

Essa Yacoub

Center of Magnetic Resonance Research, University of Minnesota, 2021 Sixth Street SE, Minneapolis, MN 55455 e-mail: yacoub@cmrr.umn.edu

Panagiotis V. Tsekos

Artemis MRI, LLC, 2322 Towerview Circle, Bloomington, MN 55431

Ioannis G. Koutlas

Oral Pathology, University of Minnesota, 515 Delaware St SE, Minneapolis, MN 55455

J Biomech Eng 126(4), 458-465 (Sep 27, 2004) (8 pages) doi:10.1115/1.1785803 History: Received February 13, 2004; Online September 27, 2004
Copyright © 2004 by ASME
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References

Figures

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Schematic representation of the device. (1) Elevated patient couch part of the device; (2) Representations of patient breasts; (3) Rotating probe stage; (4) Probe insertion and angulation mechanism; (5) Telescoping shafts; (6) Ultrasonic motors; (7) Motor control and power lines; (8) Control CPU and digital-to-analog converter; (9) Motor controllers
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The operation principle of the device, top view
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The operation principle of the device, side view. (BPH): back pivotal height, (FPH): front pivotal height
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Overview photograph of the device (patient couch not shown)
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Top view of telescoping shafts with universal joints at an angle of 45°. The center shaft controls the breast stabilization while the outer shafts control the probe height and pitch. (BPH): back pivotal height, (FPH): front pivotal height
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Schematic of the robot control hardware and software. (DAC): digital-to-analog converter card, (USM): ultrasonic motors, (MCtr): USM controllers, (Dev): Device, (OE-1): optical encoders on USM axis, (OE-2): optical encoders on the device, (MRI): MR scanner, (MRC): MR console, (LOGF): log file
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The Graphical User Interface (GUI). (BPH): back pivotal height, (FPH): front pivotal height
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MR images collected at 4 Tesla showing the stabilization of the breast phantom with the robotic device with decreasing plate distance from frame (1) to (4). The circles indicate the position of the MR-visible markers. No signal is detected from the device and the stabilization plates; the latter are depicted with an open box (stationary) and a solid box (movable). The arrow in the 4th frame points to a simulated target lesion
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MR images collected at 4 Tesla showing the insertion of a needle into the breast phantom with the robotic device. The distal portion of the needle (arrow) was filled with MR contrast agent. The circle indicates the targeted lesion

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