Application of Iterative Metal Artifact Reduction Algorithm to CT Urography for Patients With Hip Prostheses

Trabzonlu, Tugce Agirlar; Terrazas, Martha; Mozaffary, Amirhossein; Velichko, Yuri S.; Yaghmai, Vahid

doi:10.2214/ajr.19.21748

Cited by 6 publications

(4 citation statements)

References 27 publications

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“…Detailed analysis revealed that using iMAR with tin filtration led to slight artefact reduction in comparison to using a tin filter protocol without iMAR, and that using iMAR with a routine-dose protocol resulted in strong artefact reduction in comparison to a routine-dose protocol without iMAR. Previous studies (13,15,(19)(20)(21) have reported a reduction in metal artefacts from metal needles in CT-guided microwave ablation, metallic thoracic implants, hip prostheses, dental hardware, and spinal implants when iMAR is used, which is consistent with our results for metal needles in lung biopsy.…”

Section: Discussionsupporting

confidence: 92%

“…Recently, a new dedicated metal artefact reduction postprocessing algorithm-iterative metal artefact reduction (iMAR)-was developed to further reduce metal artefacts, thus improving the visualisation of the biopsy target. iMAR is an efficient technique that can be used in many situations, including for patients with hip prostheses (13), spinal instrumentation (14), and CT-guided microwave ablation (15).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Low-dose CT with tin filter combined with iterative metal artefact reduction for guiding lung biopsy

Liu¹,

Liu²,

Li³

et al. 2022

Quant Imaging Med Surg

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Low-dose CT with tin filter combined with iterative metal artefact reduction for guiding lung biopsy

Liu¹,

Liu²,

Li³

et al. 2022

Quant Imaging Med Surg

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“…This is of clinical relevance to account for impaired image quality caused by metallic implants. For orthopedic hardware, assessment of the implant itself as well as of the surrounding anatomy is clinically important to ensure the integrity of the implant and to detect potentially relevant findings in proximity that might otherwise go unnoticed [ 28 ]. In line with previous studies using conventional EID-CT systems, our results indicate that the tested iMAR algorithm alone and in combination with monoenergetic imaging at 140 keV is an effective approach to address this clinical need by providing improved image quality and diagnostic confidence compared to the standard reconstruction.…”

Section: Discussionmentioning

confidence: 99%

Photon-counting detector computed tomography for metal artifact reduction: a comparative study of different artifact reduction techniques in patients with orthopedic implants

Pallasch,

Rau,

Reisert

et al. 2024

Radiol med

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Purpose Artifacts caused by metallic implants remain a challenge in computed tomography (CT). We investigated the impact of photon-counting detector computed tomography (PCD-CT) for artifact reduction in patients with orthopedic implants with respect to image quality and diagnostic confidence using different artifact reduction approaches. Material and methods In this prospective study, consecutive patients with orthopedic implants underwent PCD-CT imaging of the implant area. Four series were reconstructed for each patient (clinical standard reconstruction [PCD-CTStd], monoenergetic images at 140 keV [PCD-CT140keV], iterative metal artifact reduction (iMAR) corrected [PCD-CTiMAR], combination of iMAR and 140 keV monoenergetic [PCD-CT140keV+iMAR]). Subsequently, three radiologists evaluated the reconstructions in a random and blinded manner for image quality, artifact severity, anatomy delineation (adjacent and distant), and diagnostic confidence using a 5-point Likert scale (5 = excellent). In addition, the coefficient of variation [CV] and the relative quantitative artifact reduction potential were obtained as objective measures. Results We enrolled 39 patients with a mean age of 67.3 ± 13.2 years (51%; n = 20 male) and a mean BMI of 26.1 ± 4 kg/m2. All image quality measures and diagnostic confidence were significantly higher for the iMAR vs. non-iMAR reconstructions (all p < 0.001). No significant effect of the different artifact reduction approaches on CV was observed (p = 0.26). The quantitative analysis indicated the most effective artifact reduction for the iMAR reconstructions, which was higher than PCD-CT140keV (p < 0.001). Conclusion PCD-CT allows for effective metal artifact reduction in patients with orthopedic implants, resulting in superior image quality and diagnostic confidence with the potential to improve patient management and clinical decision making.

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“…Finally, a combination of the DD algorithm with a metal reduction algorithm, the iterative metal artifact reduction (iMAR, Siemens Healthcare-Erlangen, Germany) [13,14], was tested on both the calibration curves and dose distributions.…”

Section: Introductionmentioning

confidence: 99%

The Role of a DirectDensity® CT Reconstruction in a Radiotherapy Workflow: A Phantom Study

et al. 2022

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The DirectDensity® CT reconstruction algorithm provides a reconstruction approach independent of the tube voltage, directly reconstructing the CT projection data into CT numbers related to the electron densities of the materials. This work examines the efficacy of DirectDensity® in the treatment planning process with both tissues and metallic materials. CT scans of a Cheese phantom were acquired at 80, 100, 120 and 140 kVp and reconstructed with different algorithms. Calibration curves were built for each kVp and reconstruction technique. To evaluate the flexibility of the DirectDensity® in dose calculations, a prostate cancer treatment plan was simulated on phantom images with and without metal inserts. Moreover, the robustness of the algorithm was tested by simulating a possible error in the selection of the calibration curve. As expected, the calibration curves related to DirectDensity® showed a tube voltage dependence only for densities above 1.82 g/cm3. The maximum percentage differences in dose distributions comparations never exceeded the 3% of tolerance and the 3D gamma analysis always returned indices greater than 90%. The results suggest that the DD reconstruction algorithm can be employed in most clinical cases and allows for a personalized radiotherapy cancer treatment workflow, maintaining its robustness and simplicity.

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Application of Iterative Metal Artifact Reduction Algorithm to CT Urography for Patients With Hip Prostheses

Cited by 6 publications

References 27 publications

Low-dose CT with tin filter combined with iterative metal artefact reduction for guiding lung biopsy

Low-dose CT with tin filter combined with iterative metal artefact reduction for guiding lung biopsy

Photon-counting detector computed tomography for metal artifact reduction: a comparative study of different artifact reduction techniques in patients with orthopedic implants

The Role of a DirectDensity® CT Reconstruction in a Radiotherapy Workflow: A Phantom Study

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