MR‐guided bone biopsy: Preliminary report of a new guiding method

Ojala, Risto; Sequeiros, Roberto Blanco; Klemola, Rauli; Vahala, Erkki; Jyrkinen, Lasse; Tervonen, Osmo

doi:10.1002/jmri.10041

Cited by 40 publications

(19 citation statements)

References 19 publications

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“…Image-guided biopsy has become an important tool to ascertain the diagnosis of malignancies in musculoskeletal [1][2][3][4] or hepatic lesions [5][6][7]. Especially in cases where computed tomography (CT) or ultrasound (US) guided methods has been unsuccessful, MR (magnetic resonance)-guided biopsy is a promising alternative, due to a high soft-tissue contrast, the option to adjust the imaging plane to the needle trajectory [8] and a good visualisation of vessels without the use of contrast agents [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Performing MR-guided biopsies in clinical routine: factors that influence accuracy and procedure time

et al. 2011

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Section: Introductionmentioning

confidence: 99%

Performing MR-guided biopsies in clinical routine: factors that influence accuracy and procedure time

et al. 2011

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“…These results do not, however, represent the true sensitivity and specificity of low-field MRI and larger patient materials with smaller lesions are needed. In reproducing the findings obtained at high-field, low-field open MRI has potential in image-guided breast procedures [19,20].…”

Section: Discussionmentioning

confidence: 99%

“…The open configuration is also of benefit when considering image-guided procedures [19]. However, the lower signal-to-noise ratio, longer imaging times and the unavailability of fat suppression based on chemical shift may have decreased the interest in low-field MRI of the breast.…”

Section: Introductionmentioning

confidence: 98%

Low-field versus high-field MRI in diagnosing breast disorders

et al. 2005

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We evaluated the performance of low-field MRI in breast disorders by comparing it with high-field MRI and biopsy results. Twenty-eight consecutive patients who were able to undergo two magnetic resonance examinations on following days were examined by high-field and low-field MRI. After T1-weighted sagittal images had been obtained a dynamic 3D axial study was performed followed by the acquisition of contrast-enhanced T1-weighted sagittal images. The images were analyzed separately by two radiologists paying attention to lesion morphology and enhancement kinetics. Six patients had problems in both breasts (34 breasts studied). The results were compared with biopsy results of 27 breasts. There were 16 malignant lesions, two fibroadenomas and nine other benign lesions. The inter-magnetic-resonance-scanner kappa value was 0.77 (substantial agreement), while the interobserver kappa value was 0.86 and 0.81 at low and high field, respectively (excellent agreement). The sensitivity was 100 and 100%, the specificity was 82 and 73% and the accuracy was 93 and 89% at low and high field, respectively. The mean lesion size was 2 cm and the smallest malignant lesion was 8 mm in diameter. Low-field MRI is a promising tool for breast imaging. Larger materials and smaller lesions are needed to evaluate its true sensitivity and specificity.

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“…9 Ojala et al, using a method similar to ours, reported the usefulness of an optical tracking system in MR-guided bone biopsy. 10 The advantages of optical tracking are real-time operation and ease of use. Since a dedicatedˆxed implement connects the cryoprobe and pointer tool, the physician can hold the probe and pointer tool together in one hand.…”

Section: Discussionmentioning

confidence: 99%

A New Image Navigation System for MR-Guided Cryosurgery

2002

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Purpose: To evaluate the feasibility of Interactive Scan Control (ISC), a new MR image navigation system, during percutaneous puncture in cryosurgery.Materials and Methods: With the ISC system in place, percutaneous MR-guided cryosurgery was performed in 26 cases, with the ISC system being used in 11 cases (ˆve renal tumors, three uterineˆbroids and three metastatic liver tumors). The ISC system comprised infrared cameras and an MR-compatible optical tracking tool that was directly connected to a cryoprobe. Tumor sizes ranged from 1.2 cm (metastatic liver tumor) to 9.0 cm (uterineˆbroid), for a mean size of 3.9 cm. With ISC, one to three cryoprobes with a diameter of 2 mm or 3 mm were advanced into the tumors with the guidance of an MR ‰uoroscopic image. Two freeze-thaw cycles were used for cryosurgery. During the cryosurgery, the formation of iceballs was monitored on MR images. Follow-up dynamic CT or MRI as well as physical examinations were conducted after two weeks and six weeks.Results: Placement of probes was successfully performed under the control of the ISC system. During cryosurgery, engulfment of the tumors by iceballs was carefully monitored by MRI. Necrosis of the cryoablated area was conˆrmed in all renal tumors by follow-up dynamic CT. The size regression of the uterineˆbroids was observed through follow-up MRI. Two of the three cases of metastatic liver tumor were ablated completely. Additional therapy for a residual tumor was performed on one patient with a metastatic liver tumor. A small amount of pneumothorax was the only complication found in a patient with a metastatic liver tumor.Conclusion: MR-guided cryosurgery with this new navigation system was feasible with low morbidity and allowed for safe and accurate puncture with a cryoprobe.

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MR‐guided bone biopsy: Preliminary report of a new guiding method

Cited by 40 publications

References 19 publications

Performing MR-guided biopsies in clinical routine: factors that influence accuracy and procedure time

Performing MR-guided biopsies in clinical routine: factors that influence accuracy and procedure time

Low-field versus high-field MRI in diagnosing breast disorders

A New Image Navigation System for MR-Guided Cryosurgery

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