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Safety and MRI Artifact Evaluation at 1.5 T of Metallic Mounting Sheath of a Marking Clip Inadvertently Deployed at Stereotactic Biopsy

¹ All authors: Department of Radiology, Mayo Clinic, 201 1st St. SW, Rochester, MN 55905.

View larger version (26K): [in a new window]   Fig. 1A. —Biopsy devices. Photographs show Biopsys 1 Micromark II device (Ethicon Endo-Surgery) (A) and sheath, disassembled mounting wire, and clip (far right) (B).

View larger version (146K): [in a new window]   Fig. 1B. —Biopsy devices. Photographs show Biopsys 1 Micromark II device (Ethicon Endo-Surgery) (A) and sheath, disassembled mounting wire, and clip (far right) (B).

View larger version (85K): [in a new window]   Fig. 2A. —Mammograms after biopsy in 69-year-old woman in whom metallic sheath remained attached to marking clip. Craniocaudal (A) and mediolateral (B) mammograms obtained immediately after biopsy show clip and mounting. Mammography performed 1 year later showed no changes.

View larger version (89K): [in a new window]   Fig. 2B. —Mammograms after biopsy in 69-year-old woman in whom metallic sheath remained attached to marking clip. Craniocaudal (A) and mediolateral (B) mammograms obtained immediately after biopsy show clip and mounting. Mammography performed 1 year later showed no changes.

View larger version (181K): [in a new window]   Fig. 3A. —MR images of phantom show artifacts varied in severity. Sagittal MR images of phantom containing (from top to bottom) mounting wire, sheath, and clip were obtained using spin-echo (A), fast spin-echo (B), and gradient-echo (C) pulse sequences. Arrows indicate clip location with artifact in phantom.

View larger version (176K): [in a new window]   Fig. 3B. —MR images of phantom show artifacts varied in severity. Sagittal MR images of phantom containing (from top to bottom) mounting wire, sheath, and clip were obtained using spin-echo (A), fast spin-echo (B), and gradient-echo (C) pulse sequences. Arrows indicate clip location with artifact in phantom.

View larger version (180K): [in a new window]   Fig. 3C. —MR images of phantom show artifacts varied in severity. Sagittal MR images of phantom containing (from top to bottom) mounting wire, sheath, and clip were obtained using spin-echo (A), fast spin-echo (B), and gradient-echo (C) pulse sequences. Arrows indicate clip location with artifact in phantom.

View larger version (137K): [in a new window]   Fig. 3D. —MR images of phantom show artifacts varied in severity. Spin-echo MR image of phantom shows no pieces of biopsy device.

View larger version (21K): [in a new window]   Fig. 4A. —Transverse gradient-echo MR images of phantom. Images through clip (A), sheath (B), and mounting wire (C) show artifact was measured as cylindric region of signal loss.

View larger version (16K): [in a new window]   Fig. 4B. —Transverse gradient-echo MR images of phantom. Images through clip (A), sheath (B), and mounting wire (C) show artifact was measured as cylindric region of signal loss.

View larger version (17K): [in a new window]   Fig. 4C. —Transverse gradient-echo MR images of phantom. Images through clip (A), sheath (B), and mounting wire (C) show artifact was measured as cylindric region of signal loss.

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