Minimizing Ferromagnetic Artefact With Metallic Lumbar Total Disc Arthroplasty Devices at Adjacent Segments

Marshman, Laurence A.G.; Strong, Graeme; Trewhella, M.; Kasis, Ata; Friesem, Tai

doi:10.1097/brs.0b013e3181c838cc

Cited by 10 publications

(6 citation statements)

References 7 publications

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“…Antosh et al 27 , demonstrated a reduction in artifacts following implantation of cobalt-chromium PCM (NuVasive, Inc., USA) and Prodisc-C (Synthes Spine, USA) prostheses by using a 0.2 T MRI. Similar data were obtained in the evaluation of adjacent segments after total arthroplasty of the lumbar spine using an MRI tomograph with a magnetic field strength of 0.3 T. 28 As one might suspect, a 3 T magnet MRI had worse artifact production following implants than 1.5 T magnets. 29 In addition, the direction of frequency encoding, slice thickness, throughput, and echo time also affect the severity of artifacts.…”

Section: Limitationssupporting

confidence: 64%

Postoperative MRI Visualization of the Cervical Spine Following Cervical Disc Arthroplasty: A Prospective Single-Center Comparison of a Titanium and Cobalt-Chromium Prosthesis

Byvaltsev

Калинин

Aliyev

et al. 2021

Global Spine Journal

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Study Design: Prospective non-randomized single-center cohort study. Objectives: To analyze the quality of postoperative magnetic resonance imaging of 2 structurally different cervical disc arthroplasty devices at the index and adjacent levels. Methods: A non-randomized, comparative, prospective, single-center study included 40 patients (23 men and 17 women) aged 32 (26-40) years. Two study groups were utilized: in the first (n = 20), a titanium prosthesis was used; in the second (n = 20), a cobalt-chromium implant was used. Evaluation of MRI studies before and after surgery was performed using sagittal and axial T2 weighted images by 2 specialists who were blinded to the prosthesis that was used. To determine the quality of an MRI image, the classification of Jarvik 2000, the radiological and orthopedic scales for assessing artifacts were used. Results: There was good-to-excellent inter-observer agreement for all of the MR parameters used for the titanium and satisfactory-to-good for the cobalt chromium group. The analysis of the quality of postoperative imaging using the Jarvik 2000 scale showed a statistically significant deterioration in MR images in the cobalt chromium group ( P < 0.001), compared to the titanium ( P = 0.091). Following a single-level total arthroplasty, the titanium group had better MRI images according to radiological and orthopedic scales ( P < 0.001). Conclusion: Titanium cervical disc arthroplasty devices result in superior postoperative MR imaging, as compared to cobalt chromium prostheses, as the latter significantly reduces image quality due to the pronounced ferromagnetic effect.

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Section: Limitationssupporting

confidence: 64%

Postoperative MRI Visualization of the Cervical Spine Following Cervical Disc Arthroplasty: A Prospective Single-Center Comparison of a Titanium and Cobalt-Chromium Prosthesis

Byvaltsev

Калинин

Aliyev

et al. 2021

Global Spine Journal

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“…The decreased UA‐RI at the placental site whereas SA‐RI remains constant may reflect the local development of the shunts at the placental site such as between spiral artery and intervillous space, because a lower RI in the more distal part of the uteroplacental circulation indicates the development of such shunts. However, this suggests the possibility that the UA‐RI was not affected because the change in UA‐RI is a local event 11 , 31 – 33 . However, future studies are needed to determine the relationship between the Doppler spiral artery resistance and histological features of vascular remodeling.…”

Section: Discussionmentioning

confidence: 99%

Can we measure the spiral and uterine artery blood flow by real‐time sonography and Doppler indices to predict spontaneous miscarriage in a normal‐risk population?

Özkan

Özyazıcı

Emiroglu

et al. 2015

Australas J Ultrason Med

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Introduction: The predictive value of spiral artery flow Doppler measurements of a subsequent early miscarriage in first trimester pregnancy is explored here. Objective: The aim of this study is to determine uterine and spiral artery blood flow changes in first trimester subsequent miscarriages and correlate within the mechanisms of the Doppler indicies. Study design: The uterine artery and spiral artery pulsatility and resistance indexes, systolic and diastolic ratios, acceleration times, and blood flow of both the right and left uterine arteries were obtained by trans vaginal color Doppler ultrasonography in consecutive viable pregnancies between 5 and 12 gestational week. Women were subsequently classified as having continuing pregnancies or pregnancy loss before 20 weeks gestation. To predict subsequent pregnancy loss, Doppler findings were adjusted for maternal age, history of previous abortion, presence of subchorionic hematoma, embryonic bradycardia, and gestational age by means of multivariate logistic regression analysis. The cut‐off values are used for the ROC curve. Results: Twenty‐five pregnancies (11.7%) were spontaneously aborted before 20 weeks of gestational age. In 29 (13.6%) cases there were previously abortion history, 30 (14%) had bradycardia, and 37 (17.3%) had subchoronic hematoma. Regarding the parameters of uterine and spiral artery pulsatility and resistive index, acceleration time, systolic/diastolic ratios and blood flows, only uterine artery S/D low values were significantly associated with pregnancy loss in the multivariate logistic regression analysis (P = 0.0001,95% CI: 4.968–55.675). Conclusion: The uterine artery systolic/diastolic ratios have a predictive value for early pregnancy loss and seem to be useful as a marker. On the other hand, spiral artery changes could be so local that they cannot be determined by the parameters of spectral Doppler techniques. This suggests that uterine vascular bed alterations should be measured to understand the prognosis of early pregnancy loss during the first trimester.

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“…All follow-up MRIs and > 90% of pre-treatment MRIs were from 1.5 T units. Metal artefact reducing techniques [13] were used on 97% of follow-up MRIs and implied thin slices (3 mm) and increased pixel bandwidth (BW), echo train length (ETL) and number of excitations (NEX). These follow-up MRIs included (a) sagittal T2-weighted FSE images: repetition time (TR) / echo time (TE), 4480-5000 ms / 92-94 ms; matrix 448x448; BW 413; ETL 30; NEX 3, (b) sagittal T1-weighted FSE images: TR / TE, 549-610 ms / 8 ms; matrix 448x448; BW 698; ETL 7; NEX 4, and (c) axial T2-weighted FSE images: TR / TE, 4201-5190 ms / 72-92 ms; matrix 320x320 or 512x512; BW 390-413; ETL 20; NEX 2-3.…”

Section: Mri Evaluationmentioning

confidence: 99%

Adjacent Disc Degeneration After Lumbar Total Disc Replacement or Nonoperative Treatment

Furunes

Hellum

Espeland

et al. 2018

Spine

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Minimizing Ferromagnetic Artefact With Metallic Lumbar Total Disc Arthroplasty Devices at Adjacent Segments

Cited by 10 publications

References 7 publications

Postoperative MRI Visualization of the Cervical Spine Following Cervical Disc Arthroplasty: A Prospective Single-Center Comparison of a Titanium and Cobalt-Chromium Prosthesis

Postoperative MRI Visualization of the Cervical Spine Following Cervical Disc Arthroplasty: A Prospective Single-Center Comparison of a Titanium and Cobalt-Chromium Prosthesis

Can we measure the spiral and uterine artery blood flow by real‐time sonography and Doppler indices to predict spontaneous miscarriage in a normal‐risk population?

Adjacent Disc Degeneration After Lumbar Total Disc Replacement or Nonoperative Treatment

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