MR imaging near metallic implants using MAVRIC SL: initial clinical experience at 3T. Acad Radiol 2015 Mar;22(3):370-9
Date
12/02/2014Pubmed ID
25435186Pubmed Central ID
PMC4323867DOI
10.1016/j.acra.2014.09.010Scopus ID
2-s2.0-84927643058 (requires institutional sign-in at Scopus site) 37 CitationsAbstract
RATIONALE AND OBJECTIVES: To compare the effectiveness of multiacquisition with variable resonance image combination selective (MAVRIC SL) with conventional two-dimensional fast spin-echo (2D-FSE) magnetic resonance (MR) techniques at 3T in imaging patients with a variety of metallic implants.
MATERIALS AND METHODS: Twenty-one 3T MR studies were obtained in 19 patients with different types of metal implants. Paired MAVRIC SL and 2D-FSE sequences were reviewed by two radiologists and compared for in-plane and through-plane metal artifact, visualization of the bone implant interface and surrounding soft tissues, blurring, and overall image quality using a two-tailed Wilcoxon signed rank test. The area of artifact on paired images was measured and compared using a paired Wilcoxon signed rank test. Changes in patient management resulting from MAVRIC SL imaging were documented.
RESULTS: Significantly less in-plane and through-plane artifact was seen with MAVRIC SL, with improved visualization of the bone-implant interface and surrounding soft tissues, and superior overall image quality (P = .0001). Increased blurring was seen with MAVRIC SL (P = .0016). MAVRIC SL significantly decreased the image artifact compared to 2D-FSE (P = .0001). Inclusion of MAVRIC SL to the imaging protocol determined the need for surgery or type of surgery in five patients and ruled out the need for surgery in 13 patients. In three patients, the area of interest was well seen on both MAVRIC SL and 2D-FSE images, so the addition of MAVRIC had no effect on patient management.
CONCLUSIONS: Imaging around metal implants with MAVRIC SL at 3T significantly improved image quality and decreased image artifact compared to conventional 2D-FSE imaging techniques and directly impacted patient management.
Author List
Gutierrez LB, Do BH, Gold GE, Hargreaves BA, Koch KM, Worters PW, Stevens KJAuthor
Kevin M. Koch PhD Center Director, Professor in the Radiology department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
AdolescentAdult
Aged
Aged, 80 and over
Artifacts
Female
Hip Joint
Hip Prosthesis
Humans
Image Interpretation, Computer-Assisted
Magnetic Resonance Imaging
Male
Metals
Middle Aged
Observer Variation
Reproducibility of Results
Young Adult
