Sixteen–Detector Row CT of Abdomen and Pelvis: Study for Optimization of Z-Axis Modulation Technique Performed in 153 Patients

Kalra, Mannudeep K.; Maher, Michael M.; Kamath, Ravi S.; Horiuchi, Tetsuya; Toth, Thomas L.; Halpern, Elkan F.; Saini, Sanjay

doi:10.1148/radiol.2331031505

Cited by 152 publications

(87 citation statements)

References 12 publications

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“…Facilities that adjust their CT technique appropriately for patient size, whether with use of manual technique charts or automatic exposure control ( 35,(39)(40)(41)(42)(43)(44)(45)(46)(47)(48)(49)(50)(51)(52)(53)(54)(55)(56), will prescribe a wide range of scanner output (CTDI) values. This is a good outcome, refl ecting the facility's conscientiousness in "right-sizing" the dose settings on the basis of specifi c patient body habitus.…”

Section: Editorial: Ct Dose Index and Patient Dosementioning

confidence: 99%

CT Dose Index and Patient Dose: They AreNotthe Same Thing

et al. 2011

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Section: Editorial: Ct Dose Index and Patient Dosementioning

confidence: 99%

CT Dose Index and Patient Dose: They AreNotthe Same Thing

et al. 2011

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“…All scans were performed at 120 kVp, 0.5 s/rotation, and under automatic exposure control (AEC) with a noise index of 10 (standard dose [SD]), 12 (three‐quarter dose [TQD], 25% dose reduction), and 15 (half‐dose [HD], 50% dose reduction) for a slice thickness of 5 mm, in the case of abdominal CT 19. The volume CT dose indices (CTDIvol) were 3.5, 2.6, and 1.7 mGy for quantitative evaluations and 6.3, 4.7, and 3.1 mGy for qualitative evaluations, respectively.…”

Section: Methodsmentioning

confidence: 99%

Quantitative and qualitative evaluation of hybrid iterative reconstruction, with and without noise power spectrum models: A phantom study

Minamishima

Sugisawa

Yamada

et al. 2018

J Applied Clin Med Phys

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The purpose of this phantom study was to investigate the feasibility of dose reduction with hybrid iterative reconstruction, with and without a noise power spectrum (NPS) model, using both quantitative and qualitative evaluations. Standard dose (SD), three‐quarter dose (TQD), and half‐dose (HD) of radiation were used. Images were reconstructed with filtered back projection (FBP), adaptive iterative dose reduction 3D (AIDR 3D) (MILD, STR), and AIDR 3D enhanced (eAIDR 3D) (eMILD, eSTR). An NPS analysis, task‐based modulation transfer function (MTF task) analysis, and comparisons of low‐contrast detectability and image texture were performed. Although the eAIDR 3D had a higher NPS value in the high‐frequency range and improved image texture and resolution as compared with AIDR 3D at the same radiation dose and iteration levels, it yielded higher noise than AIDR 3D. Additionally, although there was no statistically significant difference between SD‐FBP and the TQD series in the comparison of the mean area under the curve (AUC), the mean AUC was statistically significantly different between SD‐FBP and the HD series. NPS values in the high‐frequency range, 10% MTF task values, low‐contrast detectability, and image textures of TQD‐eMILD were comparable to those of SD‐FBP. Our findings suggested that using eMILD can reduce the radiation dose by 25%, while potentially maintaining diagnostic performance, spatial resolution, and image texture; this could support selecting the appropriate protocol in a clinical setting.

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“…Many advances have been made in decreasing radiation dose through aggressive decreases in tube current (9,10) and automatic tube current modulation (11)(12)(13)(14)(15). A decrease in tube voltage will also lead to a decrease in radiation dose at the expense of a potential increase in image noise (16).…”

Section: Patient Population and Bowel Preparationmentioning

confidence: 99%

Reducing Radiation Dose at CT Colonography: Decreasing Tube Voltage to 100 kVp

Chang¹,

Caovan²,

Grand³

et al. 2013

Radiology

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Purpose:To assess the effect of a decrease in tube voltage from 120 kVp to 100 kVp on dose, contrast-to-noise ratio (CNR), and three-dimensional (3D) image quality in patients undergoing computed tomographic (CT) colonography as well as to determine how these changes are affected by patient size. Materials and Methods:This HIPAA-compliant and institutional review board-approved retrospective study included 63 consecutive patients who underwent CT colonography and who waived informed consent. Scanning was performed with patients in the supine (120 kVp) and prone (100 kVp) positions, with other parameters unchanged. Volume CT dose index (CTDI vol ), dose-length product (DLP), image noise, attenuation of selected materials, and CNR were compared with the Wilcoxon matched-pairs signed rank test. Two readers blinded to tube voltage independently assessed 3D endoluminal image quality. The k coefficients were calculated for interobserver agreement. Average image quality ratings were compared with the Wilcoxon signed rank test. All recorded data were stratified by patient anteroposterior diameter to determine effects of patient size. Results:Decreasing tube voltage from 120 to 100 kVp resulted in a 20% decrease in CTDI vol (P , .001) and a 16% decrease in DLP (P , .001). Image noise increased by 32% (P , .001). Mean attenuation of tagged fluid increased from 395 to 487 HU (P , .001). There was no change in mean CNR of tagged fluid (17.1 at 120 kVp, 16.8 at 100 kVp; P = .37), regardless of patient size. The 3D image quality decreased slightly from a median score of 5 out of 5 to 4 out of 5 (P , .001). There was substantial interobserver agreement. Conclusion:A decrease in tube voltage from 120 to 100 kVp results in a significant decrease in radiation dose but only a minimal decrease in 3D image quality at all patient sizes.q RSNA, 2012

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Sixteen–Detector Row CT of Abdomen and Pelvis: Study for Optimization of Z-Axis Modulation Technique Performed in 153 Patients

Cited by 152 publications

References 12 publications

CT Dose Index and Patient Dose: They AreNotthe Same Thing

CT Dose Index and Patient Dose: They AreNotthe Same Thing

Quantitative and qualitative evaluation of hybrid iterative reconstruction, with and without noise power spectrum models: A phantom study

Reducing Radiation Dose at CT Colonography: Decreasing Tube Voltage to 100 kVp

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