Multi-detector CT imaging in the postoperative orthopedic patient with metal hardware

Berg, Bruno; Maldague, Baudouin; Lecouvet, Frédéric

doi:10.1016/j.ejrad.2006.08.008

Cited by 63 publications

(18 citation statements)

References 33 publications

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“…Ultimately, they lead to an incorrect attenuation measurement at each projection. [1][2][3] Scattering and quantum noise are also greatly increased by the presence of high-Z materials. 4 The resulting image degradation impacts radiotherapy planning at different levels: disease diagnoses and staging, region of interest identification and delineation, and incorrect tissue density prediction for dose calculation purposes.…”

Section: Introductionmentioning

confidence: 99%

The impact of low-Z and high-Z metal implants in IMRT: A Monte Carlo study of dose inaccuracies in commercial dose algorithms

et al. 2013

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Section: Introductionmentioning

confidence: 99%

The impact of low-Z and high-Z metal implants in IMRT: A Monte Carlo study of dose inaccuracies in commercial dose algorithms

et al. 2013

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“…One of the indications to perform CT arthrography rather than MRI is the presence of metallic artifacts in the setting of postoperative patients. Metallic artifacts usually remain mild on new generation CT scanners compared to MRI (22, 65). They can be diminished and, more generally, SNR can be increased by retrospectively increasing the thickness of the reformats and using soft tissue algorithms; however, at the expense of spatial resolution (66, 67).…”

Section: Technical Considerationsmentioning

confidence: 99%

Glenohumeral joint instability

Omoumi

Teixeira

Lecouvet

et al. 2010

Magnetic Resonance Imaging

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Due to the configuration of its bony elements, the glenohumeral joint is the most mobile joint of the body, but also an inherently unstable articulation. Stabilization of the joint is linked to a complex balance between static and dynamic soft tissue stabilizers. Because of complex biomechanics, and the existence of numerous classifications and acronyms to describe shoulder instability lesions, this remains a daunting topic for most radiologists. In this article we provide a brief review of the anatomy of the glenohumeral joint, as well as the classifications and the pathogenesis of shoulder instability. Technical aspects related to the available imaging techniques (including computed tomography [CT] arthrography, magnetic resonance imaging [MRI], and MR arthrography) are reviewed. We then describe the imaging findings related to shoulder instability, focusing on those elements that are important to the clinician.

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“…16-20 By increasing peak voltage, increasing tube current, decreasing the pitch, and by using an extended CT scale, 21 image quality can be improved. Multiplanar reconstruction and increasing slice thickness have also been applied to cut down the amount of artefact.…”

Section: Introductionmentioning

confidence: 99%

“…Multiplanar reconstruction and increasing slice thickness have also been applied to cut down the amount of artefact. 21-23 …”

Section: Introductionmentioning

confidence: 99%

Assessment of wear and periacetabular osteolysis using dual energy computed tomography on a pig cadaver to identify the lowest acceptable radiation dose

Sandgren

Skorpil

Nowik

et al. 2016

Bone & Joint Research

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ObjectivesComputed tomography (CT) plays an important role in evaluating wear and periacetabular osteolysis (PAO) in total hip replacements. One concern with CT is the high radiation exposure since standard pelvic CT provides approximately 3.5 millisieverts (mSv) of radiation exposure, whereas a planar radiographic examination with three projections totals approximately 0.5 mSv. The objective of this study was to evaluate the lowest acceptable radiation dose for dual-energy CT (DECT) images when measuring wear and periacetabular osteolysis in uncemented metal components.Materials and MethodsA porcine pelvis with bilateral uncemented hip prostheses and with known linear wear and acetabular bone defects was examined in a third-generation multidetector DECT scanner. The examinations were performed with four different radiation levels both with and without iterative reconstruction techniques. From the high and low peak kilo voltage acquisitions, polychrmoatic images were created together with virtual monochromatic images of energies 100 kiloelectron volts (keV) and 150 keV.ResultsWe could assess wear and PAO while substantially lowering the effective radiation dose to 0.7 mSv for a total pelvic view with an accuracy of around 0.5 mm for linear wear and 2 mm to 3 mm for PAO.ConclusionCT for detection of prosthetic wear and PAO could be used with clinically acceptable accuracy at a radiation exposure level equal to plain radiographic exposures.Cite this article: B. Sandgren, M. Skorpil, P. Nowik, H. Olivecrona, J. Crafoord, L. Weidenhielm, A. Persson. Assessment of wear and periacetabular osteolysis using dual energy computed tomography on a pig cadaver to identify the lowest acceptable radiation dose. Bone Joint Res 2016;5:307–313. DOI: 10.1302/2046-3758.57.2000566.

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Multi-detector CT imaging in the postoperative orthopedic patient with metal hardware

Cited by 63 publications

References 33 publications

The impact of low-Z and high-Z metal implants in IMRT: A Monte Carlo study of dose inaccuracies in commercial dose algorithms

The impact of low-Z and high-Z metal implants in IMRT: A Monte Carlo study of dose inaccuracies in commercial dose algorithms

Glenohumeral joint instability

Assessment of wear and periacetabular osteolysis using dual energy computed tomography on a pig cadaver to identify the lowest acceptable radiation dose

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