CT scans through metal scanning technique versus hardware composition

Haramati, Nogah; Staron, Ronald B.; Mazel-Sperling, Karen; Freeman, Katherine; Nickoloff, Edward L.; Barax, Charles N.; Feldman, Frieda

doi:10.1016/0895-6111(94)90080-9

Cited by 102 publications

(69 citation statements)

References 18 publications

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“…Promising mathematical algorithms were also proposed for artifact reduction on diagnostic CT images. ( 6 , 7 ) But manufacturers have not yet implemented them for clinical use. In radiotherapy application, metal artifacts greatly limit the usefulness of kVCT images for contouring the target as well as organs at risk.…”

Section: Introductionmentioning

confidence: 99%

A planning study for palliative spine treatment using StatRT and megavoltage CT simulation

Rong

Yadav

Paliwal

et al. 2010

J Applied Clin Med Phys

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Megavoltage CT (MVCT) simulation on the TomoTherapy Hi·Art system is an alternative to conventional CT for treatment planning in the presence of severe metal artifact. StatRT is a new feature that was implemented on the TomoTherapy operator station for performing online MVCT scanning, treatment planning and treatment delivery in one session. The clinical feasibility of using the StatRT technique and MVCT simulation to palliative treatment for a patient with substantial spinal metallic hardware is described. A patient with metastatic non‐small‐cell lung cancer involving the thoracic spine underwent conventional kilovoltage CT simulation. The metal artifact due to stainless steel spine‐stabilizing rods was too severe for treatment planning, despite attempts to correct using density override. The patient was then re‐scanned using MVCT on a tomotherapy unit. Plans were generated using both StatRT and conventional tomotherapy planning (Tomo plan) with different settings for comparison. StatRT planning ran a total of five iterations in a short planning window (10–15 min). Two Tomo plans were generated using: (1) five iterations in the “full scatter” mode, and (2) 300 iterations in the “beamlet” mode. It was noted that the DVH of the StatRT plan was almost identical to the Tomo plan optimized by the “full scatter” mode and the same number of iterations. Dose distribution analysis reveals that these three planning methods yielded comparable doses to heart, lungs and targets. This work also demonstrated that undermodulation can result in a high degree of thread effects. The overall time for the treatment process (including 7 minutes for simulation, 15 minutes for contouring, 10 minutes for planning and 5 minutes for delivery) decreases from hours to around 40 minutes using the StatRT procedure. StatRT is a feasible treatment‐planning tool for physicians to scan, contour and treat patients within one hour. This can be particularly beneficial in urgent palliative treatments.Conflict of Interest Statement: James S. Welsh has received honoraria for speaking for TomoTherapy, Inc.; Yi Rong has received travel sponsorship for TomoTherapy, Inc.PACS numbers: 87.55.D‐, 87.57.C‐

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Section: Introductionmentioning

confidence: 99%

A planning study for palliative spine treatment using StatRT and megavoltage CT simulation

Rong

Yadav

Paliwal

et al. 2010

J Applied Clin Med Phys

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“…Thin body parts and thinner parts of the metallic hardware attenuate X-ray beams less than their thicker counterparts producing fewer image-degrading artifacts [47][48][49][50] . This could be of clinical application in imaging of the reconstructed cervical spine with downward traction of the shoulders while raising the arms above the head for imaging of the reconstructed dorsal and lumbar spinal regions [47][48][49][50] . On the other hand, control of the following imaging factors can significantly improve the resultant hardware images and allows accurate answering of relevant clinical questions.…”

Section: B Amentioning

confidence: 99%

“…Hardware-related factors are beyond the control of the imager. Orthopedic hardware composed of lower X-ray beam attenuation coefficients (density) materials results in fewer artifacts e.g., titanium alloys produce fewer artifacts than stainless steel alloys [47][48][49][50] . Thin body parts and thinner parts of the metallic hardware attenuate X-ray beams less than their thicker counterparts producing fewer image-degrading artifacts [47][48][49][50] .…”

Section: B Amentioning

confidence: 99%

“…Orthopedic hardware composed of lower X-ray beam attenuation coefficients (density) materials results in fewer artifacts e.g., titanium alloys produce fewer artifacts than stainless steel alloys [47][48][49][50] . Thin body parts and thinner parts of the metallic hardware attenuate X-ray beams less than their thicker counterparts producing fewer image-degrading artifacts [47][48][49][50] . This could be of clinical application in imaging of the reconstructed cervical spine with downward traction of the shoulders while raising the arms above the head for imaging of the reconstructed dorsal and lumbar spinal regions [47][48][49][50] .…”

Section: B Amentioning

confidence: 99%

“…However, in chubbier patients and thicker parts such as the dorsal, lumbar and sacral spines, a higher KVp, e.g., 140 KVp can increase the ability of the X-ray beam to penetrate metal [47,51,52] . X-ray tube current: An appropriate increase in tube current setting using the tube's larger focal spot increases the ability of the X-ray beam to penetrate metal [48][49][50][51][52] .…”

Section: X-ray Kilovolt Peakmentioning

confidence: 99%

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Spinal fusion-hardware construct: Basic concepts and imaging review

Nouh¹

2012

WJR

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The interpretation of spinal images fixed with metallic hardware forms an increasing bulk of daily practice in a bus�� imaging department. Radio�ogists are required to be familiar with the instrumentation and operative options used in spinal fixation and fusion procedures, especia�� in his or her institute. This is critica� in eva�uat-ing the position of imp�ants and potentia� comp�ications associated with the operative approaches and spinal fixation devices used. Thus, the radiologist can play an important role in patient care and outcome. This review out�ines the advantages and disadvantages of common�� used imaging methods and reports on the best yield for each modality and how to overcome the problematic issues associated with the presence of metallic hardware during imaging. Baseline radiographs are essentia� as the�� are the base�ine point for eva�uation of future studies shou�d patients deve�op s��mptoms suggesting possib�e comp�ications. The�� ma�� justif�� further imaging workup with computed tomography, magnetic resonance and/or nuc�ear medicine studies as the eva�u-ation of a patient with a spinal implant involves a multimodality approach. This review describes imaging features of potential complications associated with spinal fusion surgery as well as the instrumentation used. This basic knowledge aims to help radiologists approach ever��da�� practice in c�inica� imaging.

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A Novel Noniterative Metal Artifact Reduction Method Using Coherence Transport with Fast Marching in Computed Tomography

Zhang

et al. 2012

Int J Imaging Syst Tech

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Metal artifact reduction (MAR) is still a challenging problem in current computed tomography reconstruction. Traditional methods usually use the unaffected projection data in the same degree to interpolate contaminated positions in the bins. The continuality and smoothness features become hard to fulfill. In this article, we propose a novel noniterative MAR method that uses coherence transport with fast marching. Two-dimensional information, including the neighboring bins, is used to inpaint the uncorrected sinogram with a special form of weighted average according to a sequence calculated by the fast marching method. The results of the experiments and the quantitative analysis demonstrate that the proposed method can effectively suppress the artifacts caused by metal with a high-attenuation coefficient. Compared with linear interpolation, the proposed method can introduce less streak artifacts and obtain more accurate structure information of organs. Figure 5. (a) Original image with metal implants. (b) The reconstructed image for Figure 5a using the proposed method. (c) Original image with bilateral implants in the pelvic region. (d) The reconstructed image for Figure 5c using the proposed method. (e) Original image with metal implants in cervical vertebra. (f) The reconstructed image for Figure 5e using the proposed method. , X-ray CT metal artifact reduction using wavelets: An application for imaging total hip prostheses,

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CT scans through metal scanning technique versus hardware composition

Cited by 102 publications

References 18 publications

A planning study for palliative spine treatment using StatRT and megavoltage CT simulation

A planning study for palliative spine treatment using StatRT and megavoltage CT simulation

Spinal fusion-hardware construct: Basic concepts and imaging review

A Novel Noniterative Metal Artifact Reduction Method Using Coherence Transport with Fast Marching in Computed Tomography

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