Effect of gantry rotation speed and scan mode on peristalsis motion artifact frequency and severity at abdominal CT

Shah, Rutwik; Khoram, Rhanna; Lambert, Jack W.; Sun, Yuxin; Wang, Zhen J.; Webb, Emily M.; Yeh, Benjamin M.

doi:10.1007/s00261-018-1497-0

Cited by 11 publications

(7 citation statements)

References 22 publications

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“…Since liver lesions may be small or have poor contrast resolution, optimization of image quality is critical. Artifacts in CT may degrade image quality and compromise diagnostic accuracy, potentially leading to repeated scans and inappropriate patient management [2,3]. Several causes for CT artifacts are known and can be classified into physics-based, scannerbased, reconstruction-based, and patient-based artifacts [2].…”

Section: Introductionmentioning

confidence: 99%

Reduction of Peristalsis-Related Streak Artifacts on the Liver with Dual-Layer Spectral CT

et al. 2022

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Background: Peristalsis-related streak artifacts on the liver compromise image quality and diagnostic accuracy. Purpose: To assess dual-layer spectral-detector computed tomography (CT) image reconstructions for reducing intestinal peristalsis-related streak artifacts on the liver. Methods: We retrospectively evaluated 220 contrast-enhanced abdominal dual-energy CT scans in 131 consecutive patients (mean age: 68 ± 10 years, 120 men) who underwent routine clinical dual-layer spectral-detector CT imaging (120 kVp, 40 keV, 200 keV, virtual non-contrast (VNC), iodine images). Two independent readers evaluated bowel peristalsis streak artifacts on the liver qualitatively on a five-point Likert scale (1 = none to 5 = severe) and quantitatively by depth of streak artifact extension into the liver and measurements of Hounsfield Unit and iodine concentration differences from normal liver. Artifact severity between image reconstructions were compared by Wilcoxon signed-rank and paired t-tests. Results: 12 scans were excluded due to missing spectral data, artifacts on the liver originating from metallic foreign materials, or oral contrast material. Streak artifacts on the liver were seen in 51/208 (25%) scans and involved the left lobe only in 49/51 (96%), the right lobe only in 0/51 (0%), and both lobes in 2/51 (4%) scans. Artifact frequency was lower in iodine than in 120 kVp images (scans 18/208 vs. 51/208, p < 0.001). Artifact severity was less in iodine than in 120 kVp images (median score 1 vs. 3, p < 0.001). Streak artifact extension into the liver was shorter in iodine than 120 kVp images (mean length 2 ± 4 vs. 12 ± 5 mm, p < 0.001). Hounsfield Unit and iodine concentration differed significantly between bright streak artifacts and normal liver in 120 kVp, 40 keV, 200 keV, and VNC images (p < 0.001, each), but not in iodine images (p = 0.23). Conclusion: Intestinal peristalsis-related streak artifacts commonly affect the left liver lobe at CT and can be substantially reduced by viewing iodine dual-energy CT image reconstructions.

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Section: Introductionmentioning

confidence: 99%

Reduction of Peristalsis-Related Streak Artifacts on the Liver with Dual-Layer Spectral CT

et al. 2022

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“…Optimization of CT image quality is essential for accurate assessment of the liver, as it is commonly affected by metastases and primary tumors that may be small or subtle. Image artifacts at CT degrade image quality and may compromise diagnostic accuracy [ 1 , 2 ].…”

Section: Introductionmentioning

confidence: 99%

“…Different types of CT image artifacts are known to relate to CT data acquisition, image reconstruction, metallic implants, and patient motion [ 1 , 2 , 3 , 4 , 5 ]. In particular, motion-related artifacts caused by involuntary movement such as intestinal peristalsis or cardiac motion are challenging.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, motion-related artifacts caused by involuntary movement such as intestinal peristalsis or cardiac motion are challenging. The peristalsis-related movement of intraluminal gas in the stomach or bowel during CT scanning can cause bright and dark streak artifacts in CT images [ 2 , 6 , 7 , 8 ]. Due to the anatomical proximity of the liver to the stomach, the liver, particularly the left liver lobe, is frequently affected by visceral-motion-related artifacts [ 7 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

“…Advances in CT techniques such as rapid scanning and software-based correction algorithms can reduce the severity and frequency of visceral-motion-related artifacts [ 2 , 10 , 11 ]. However, with a prevalence ranging from 25% to 70%, these artifacts remain frequent in CT scans of the abdomen, often affecting the liver [ 2 , 7 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

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Reducing Visceral-Motion-Related Artifacts on the Liver with Dual-Energy CT: A Comparison of Four Different CT Scanner Techniques

et al. 2022

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Purpose: To assess the influence of different dual-energy CT (DECT) scanner techniques on the severity of visceral-motion-related artifacts on the liver. Methods: Two independent readers retrospectively evaluated visceral-motion-related artifacts on the liver on 120-kVp(-like), monoenergetic low- and high-keV, virtual non-contrast (VNC), and iodine images acquired on a dual-source, twin-beam, fast kV-switching, and dual-layer spectral detector scanner. Quantitative assessment: Depth of artifact extension into the liver, measurements of Hounsfield Units (HU) and iodine concentrations. Qualitative assessment: Five-point Likert scale (1 = none to 5 = severe). Artifact severity between image reconstructions were compared by Wilcoxon signed-rank and paired t-tests. Results: 615 contrast-enhanced routine clinical DECT scans of the abdomen were evaluated in 458 consecutive patients (mean age: 61 ± 14 years, 331 men). For dual-source and twin-beam scanners, depth of extension of artifacts into the liver was significantly shorter and artifact severity scores significantly lower for 120-kVp-like images compared with the other image reconstructions (p < 0.001, each). For fast kV-switching and spectral detector scanner images, depth of extension of artifacts was significantly shorter and artifact severity scores significantly lower for iodine images (p < 0.001, each). Dual-source 120-kVp-like and spectral detector iodine images reduced artifacts to an extent that no significant difference in HU or iodine concentrations between artifacts (dual-source: 97 HU, spectral detector: 1.9 mg/mL) and unaffected liver parenchyma (dual-source: 108 HU, spectral detector: 2.1 mg/mL) was measurable (dual-source: p = 0.32, spectral detector: p = 0.15). Conclusion: Visceral-motion-related artifacts on the liver can be markedly reduced by viewing 120-kVp-like images for dual-source and twin-beam DECT scanners and iodine images for fast kV-switching and dual-layer spectral detector DECT scanners.

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Bowel Imaging

Obmann

2022

Spectral Imaging

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Effect of gantry rotation speed and scan mode on peristalsis motion artifact frequency and severity at abdominal CT

Abstract: Peristalsis artifacts are common at abdominopelvic CT scans. Fast gantry rotation speed significantly reduces the frequency of bowel peristalsis artifacts and should be a consideration when imaging of bowel and structures near bowel is critical.

Cited by 11 publications

References 22 publications

Reduction of Peristalsis-Related Streak Artifacts on the Liver with Dual-Layer Spectral CT

Reduction of Peristalsis-Related Streak Artifacts on the Liver with Dual-Layer Spectral CT

Reducing Visceral-Motion-Related Artifacts on the Liver with Dual-Energy CT: A Comparison of Four Different CT Scanner Techniques

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