Quantitative evaluation of artefact reduction from metallic dental materials in short tau inversion recovery imaging: efficacy of syngo WARP at 3.0 tesla

Objectives: To evaluate the effects of syngo WARP on reducing metal artefacts from dental materials. Methods: Short tau inversion recovery (STIR) with syngo WARP [a dedicated metal artefact reduction sequence in combination with view-angle-tilting (VAT)] was performed using phantoms of three dental alloys: cobalt–chromium (Co–Cr), nickel–chromium (Ni–Cr), and titanium (Ti). Artefact volumes and reduction ratios of black, white and overall artefacts in the standard STIR and syngo WARP images with several different parameter settings were quantified according to standards of the American Society for Testing and Materials F2119-07. In all sequences, the artefact volumes and reduction ratios were compared. The modulation transfer function (MTF) and contrast-to-noise ratio (CNR) were also measured for evaluation of image quality. Results: In standard STIR, the overall artefact volume of Co–Cr was markedly larger than those of Ni–Cr and Ti. All types of artefacts tended to be reduced with increasing receiver bandwidth (rBW) and VAT. The effect of artefact reduction tended to be more obvious in the axial plane than in the sagittal plane. Compared with standard STIR, syngo WARP with a matrix of 384 × 384, receiver bandwidth of 620 Hz/pixel, and VAT of 100 % in the axial plane obtained reduction effects of 30 % (white artefacts), 45 % (black artefacts), and 38 % (overall artefacts) although MTF and CNR decreased by 30 and 22 % compared with those of standard STIR, respectively. Conclusions: syngo WARP for STIR can effectively reduce metal artefacts from dental materials.

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Magnetic resonance imaging of ankle tendon pathology: benefits of additional axial short-tau inversion recovery imaging to reduce magic angle effects

Skeletal Radiology ◽

10.1007/s00256-012-1550-y ◽

2012 ◽

Vol 42 (4) ◽

pp. 499-510 ◽

Cited By ~ 7

Author(s):

Waraporn Srikhum ◽

Lorenzo Nardo ◽

Dimitrios C. Karampinos ◽

Gerd Melkus ◽

Theresa Poulos ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Inversion Recovery ◽

Magic Angle ◽

Resonance Imaging ◽

Inversion Recovery Imaging ◽

Tendon Pathology ◽

Short Tau Inversion Recovery

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Incidence of osteonecrosis and insufficiency fracture of the hip and knee joints based on MRI in 300 renal transplant patients

Hip International ◽

10.1177/1120700018808693 ◽

2018 ◽

Vol 29 (3) ◽

pp. 316-321 ◽

Cited By ~ 1

Author(s):

Tadahiko Ohtsuru ◽

Takuaki Yamamoto ◽

Yasuaki Murata ◽

Yuji Morita ◽

Yutaro Munakata ◽

...

Keyword(s):

Renal Transplant ◽

Femoral Head ◽

Femoral Neck ◽

Correct Diagnosis ◽

Insufficiency Fracture ◽

Inversion Recovery ◽

Axial Plane ◽

Transplant Patients ◽

Renal Transplant Patients ◽

Short Tau Inversion Recovery

Introduction: The purpose of this study was to investigate the incidence of necrosis and insufficiency fracture of the hip and knee using magnetic resonance imaging (MRI) in renal transplant patients. Methods: We examined 300 consecutive renal transplant patients using MRI of the hips and knees (T1-weighted coronal MRI) preoperatively and at 3 and 6 months postoperatively. Oblique axial-plane T1-weighted MRI and short-tau inversion-recovery T2-weighted MRI were performed parallel to the femoral neck when distinguishing the osteonecrosis of the femoral head (ONFH) from subchondral insufficiency fracture (SIF) of the femoral head was difficult. Results: ONFH was observed in 3 hips (3 cases, 1.0%). Osteonecrosis of the knee was observed in 2 knees (1 case, 0.3%). SIF of the femoral head was observed in 5 hips (3 cases, 1.0%). Bilateral simultaneous onset of SIF of the femoral head was observed in 2 cases (0.7%). Insufficiency fracture of the knee was observed in 2 knees (1 case, 0.3%). Conclusions: When it was difficult to distinguish ONFH from SIF of the femoral head, oblique axial-plane T1-weighted MRI and the short-tau inversion-recovery T2-weighted MRI parallel to the femoral neck were useful to establish the correct diagnosis.

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Deep‐learned short tau inversion recovery imaging using multi‐contrast MR images

Magnetic Resonance in Medicine ◽

10.1002/mrm.28327 ◽

2020 ◽

Vol 84 (6) ◽

pp. 2994-3008

Author(s):

Sewon Kim ◽

Hanbyol Jang ◽

Jinseong Jang ◽

Young Han Lee ◽

Dosik Hwang

Keyword(s):

Inversion Recovery ◽

Mr Images ◽

Inversion Recovery Imaging ◽

Short Tau Inversion Recovery

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Increased Signal in the Subarachnoid Space on Fluid-Attenuated Inversion Recovery Imaging Associated with the Clearance Dynamics of Gadolinium Chelate: A Potential Diagnostic Pitfall

Yearbook of Neurology and Neurosurgery ◽

10.1016/s0513-5117(08)79082-3 ◽

2008 ◽

Vol 2008 ◽

pp. 142-143

Author(s):

A. Verma

Keyword(s):

Subarachnoid Space ◽

Inversion Recovery ◽

Gadolinium Chelate ◽

Diagnostic Pitfall ◽

Inversion Recovery Imaging ◽

Fluid Attenuated Inversion Recovery

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Faculty Opinions recommendation of Negative fluid-attenuated inversion recovery imaging identifies acute ischemic stroke at 3 hours or less.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.1164342.626064 ◽

2009 ◽

Author(s):

Anna Czlonkowska

Keyword(s):

Ischemic Stroke ◽

Acute Ischemic Stroke ◽

Inversion Recovery ◽

Inversion Recovery Imaging ◽

Fluid Attenuated Inversion Recovery

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Factors affecting lateral mass screw placement at C-7

Journal of Neurosurgery Spine ◽

10.3171/2010.11.spine09776 ◽

2011 ◽

Vol 14 (3) ◽

pp. 405-411 ◽

Cited By ~ 7

Author(s):

Kalil G. Abdullah ◽

Amy S. Nowacki ◽

Michael P. Steinmetz ◽

Jeffrey C. Wang ◽

Thomas E. Mroz

Keyword(s):

Sagittal Plane ◽

Anatomical Variation ◽

Axial Plane ◽

Screw Placement ◽

Lateral Mass ◽

Lateral Mass Screw ◽

Modified Technique ◽

Modified Method ◽

Starting Point ◽

Lateral Mass Screws

Object The C-7 lateral mass has been considered difficult to fit with instrumentation because of its unique anatomy. Of the methods that exist for placing lateral mass screws, none particularly accommodates this anatomical variation. The authors have related 12 distinct morphological measures of the C-7 lateral mass to the ability to place a lateral mass screw using the Magerl, Roy-Camille, and a modified Roy-Camille method. Methods Using CT scans, the authors performed virtual screw placement of lateral mass screws at the C-7 level in 25 male and 25 female patients. Complications recorded included foraminal and articular process violations, inability to achieve bony purchase, and inability to place a screw longer than 6 mm. Violations were monitored in the coronal, axial, and sagittal planes. The Roy-Camille technique was applied starting directly in the middle of the lateral mass, as defined by Pait's quadrants, with an axial angle of 15° lateral and a sagittal angle of 90°. The Magerl technique was performed by starting in the inferior portion of the top right square of Pait's quadrants and angling 25° laterally in the axial plane with a 45° cephalad angle in the sagittal plane. In a modified method, the starting point is similar to the Magerl technique in the top right square of Pait's quadrant and then angling 15° laterally in the axial plane. In the sagittal plane, a 90° angle is taken perpendicular to the dorsal portion of the lateral mass, as in the traditional Roy-Camille technique. Results Of all the morphological methods analyzed, only a combined measure of intrusion of the T-1 facet and the overall length of the C-7 lateral mass was statistically associated with screw placement, and only in the Roy-Camille technique. Use of the Magerl technique allowed screw placement in 28 patients; use of the Roy-Camille technique allowed placement in 24 patients; and use of the modified technique allowed placement in 46 patients. No screw placement by any method was possible in 4 patients. Conclusions There is only one distinct anatomical ratio that was shown to affect lateral mass screw placement at C-7. This ratio incorporates the overall length of the lateral mass and the amount of space occupied by the T-1 facet at C-7. Based on this virtual study, a modified Roy-Camille technique that utilizes a higher starting point may decrease the complication rate at C-7 by avoiding placement of the lateral mass screw into the T1 facet.

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