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Open Access 01-12-2015 | Research article

Novel MR imaging method – MAVRIC – for metal artifact suppression after joint replacement in musculoskeletal tumor patients

Authors: Michiro Susa, Sota Oguro, Kazutaka Kikuta, Kazumasa Nishimoto, Keisuke Horiuchi, Masahiro Jinzaki, Masaya Nakamura, Morio Matsumoto, Kazuhiro Chiba, Hideo Morioka

Published in: BMC Musculoskeletal Disorders | Issue 1/2015

Abstract

Background

Standard imaging modality for the follow-up after prosthetic replacements for musculoskeletal tumor patients has been conventional radiography. This technique is effective in detecting subtle changes in bone adjacent to metal implants, but in many cases, radiographs do not lead to definitive diagnosis of postoperative adverse events such as acute infection, local recurrence of soft tissue tumor or soft tissue local recurrence of osseous sarcoma. Conventional MRI sequences have not been effective due to metal artifacts. In this study, we tried to elucidate the effectiveness of metal artifact suppression using novel sequence, multiacquisition variable-resonance image combination (MAVRIC), after musculoskeletal tumor surgeries.

Methods

We retrospectively analyzed 5 cases of malignant bone and soft tissue sarcoma patients who were reconstructed with metal prosthesis after wide resection of tumors. Images obtained using MAVRIC and short tau inversion recovery (STIR) were compared side by side. The paired MAVRIC and STIR images were qualitatively compared independently by two specialists for 4 parameters: visualization of bone - implant interface, visualization of surrounding soft tissues, image blurring, and overall image quality. Quantitatively, paired images were reviewed to identify the slice where the metal artifact was maximal, and a region of interest encompassing the implant and surrounding artifact was drawn using Advantage Workstation (GE Healthcare, Japan).

Results

There were no local recurrences that were detected. By utilizing MAVRIC, visualization of the bone - implant interface and visualization of the surrounding soft tissue were significantly improved in MAVRIC compared to STIR. Although blurring was worse on the MAVRIC acquisitions, the overall image quality was still better on MAVRIC. Quantitatively, the area of metal artifact measured using MAVRIC was markedly less compared to STIR (61.4 cm² vs 135.9 cm²).

Conclusion

Despite the relatively small number of cases in the present study, our observation strongly suggests that MAVRIC is able to improve the quality of images by decreasing the artifact caused by endoprosthesis, frequently utilized in reconstruction of musculoskeletal tumor patients. Further installments of conventional imaging sequences with the addition of gadolinium - enhancement will enable increased accuracy in diagnosing local recurrences of sarcoma patients.

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Title: Novel MR imaging method – MAVRIC – for metal artifact suppression after joint replacement in musculoskeletal tumor patients
Authors: Michiro Susa
Sota Oguro
Kazutaka Kikuta
Kazumasa Nishimoto
Keisuke Horiuchi
Masahiro Jinzaki
Masaya Nakamura
Morio Matsumoto
Kazuhiro Chiba
Hideo Morioka
Publication date: 01-12-2015
Publisher: BioMed Central
Published in: BMC Musculoskeletal Disorders / Issue 1/2015
Electronic ISSN: 1471-2474
DOI: https://doi.org/10.1186/s12891-015-0838-1

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Novel MR imaging method – MAVRIC – for metal artifact suppression after joint replacement in musculoskeletal tumor patients

Abstract

Background

Methods

Results

Conclusion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background

Methods

Results

Conclusion

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