Effect of Patient Size on Radiation Dose for Abdominal MDCT with Automatic Tube Current Modulation: Phantom Study

Schindera, Sebastian T.; Nelson, Rendon C.; Toth, Thomas L.; Nguyen, Giao; Toncheva, Greta; DeLong, David M.; Yoshizumi, Terry T.

doi:10.2214/ajr.07.2891

Cited by 100 publications

(65 citation statements)

References 12 publications

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“…split-bolus technique) [38,39] • Adjustment of image quality reference values of the automatic tube current modulation for oversized patients [40] • Reduction of the tube voltage and/or tube current for survey CT [41,42] • Positioning of the X-ray tube below the table for the survey CT (e.g. 180°, postero-anterior position) [41,42] • Prevention of the routine use of narrow collimations (e.g.…”

Section: Resultsmentioning

confidence: 99%

An education and training programme for radiological institutes: impact on the reduction of the CT radiation dose

et al. 2011

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Objectives To establish an education and training programme for the reduction of CT radiation doses and to assess this programme's efficacy. Methods Ten radiological institutes were counselled. The optimisation programme included a small group workshop and a lecture on radiation dose reduction strategies. The radiation dose used for five CT protocols (paranasal sinuses, brain, chest, pulmonary angiography and abdomen) was assessed using the dose-length product (DLP) before and after the optimisation programme. The mean DLP values were compared with national diagnostic reference levels (DRLs). Results The average reduction of the DLP after optimisation was 37% for the sinuses (180 vs. 113 mGycm, P< 0.001), 9% for the brain (982 vs. 896 mGycm, P<0.05), 24% for the chest (425 vs. 322 mGycm, P<0.05) and 42% for the pulmonary arteries (352 vs. 203 mGycm, P<0.001). No significant change in DLP was found for abdominal CT. The post-optimisation DLP values of the sinuses, brain, chest, pulmonary arteries and abdomen were 68%, 10%, 20%, 55% and 15% below the DRL, respectively. Conclusions The education and training programme for radiological institutes is effective in achieving a substantial reduction in CT radiation dose.

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Section: Resultsmentioning

confidence: 99%

An education and training programme for radiological institutes: impact on the reduction of the CT radiation dose

et al. 2011

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“…Even the ATCM technique which modulates tube current with respect to patient asymmetry, patient size is an important parameter that should be considered. Abdominal scans on multislice CT with tube current modulation convey considerably higher doses to oversized patients than thin patients [20].…”

Section: Introductionmentioning

confidence: 99%

Impact of miscentering on patient dose and image noise in x-ray CT imaging: Phantom and clinical studies

et al. 2012

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The operation of the bowtie filter in x-ray CT is correct if the object being scanned is properly centered in the scanner's field-of-view. Otherwise, the dose delivered to the patient and image noise will deviate from optimal setting. We investigate the effect of miscentering on image noise and surface dose on three commercial CT scanners. Six cylindrical phantoms with different size and material were scanned on each scanner. The phantoms were positioned at 0, 2, 4 and 6 cm below the isocenter of the scanner's field-of-view. Regression models of surface dose and noise were produced as a function of miscentering magnitude and phantom's size. 480 patients were assessed using the calculated regression models to estimate the influence of patient miscentering on image noise and patient surface dose in seven imaging centers. For the 64-slice CT scanner, the maximum increase of surface dose using the CTDI-32 phantom was 13.5%, 33.3% and 51.1% for miscenterings of 2, 4 and 6 cm, respectively. The analysis of patients' scout scans showed miscentering of 2.2 cm in average below the isocenter. An average increase of 23% and 7% was observed for patient dose and image noise, respectively. The maximum variation in patient miscentering derived from the comparison of imaging centers using the same scanner was 1.6 cm. Patient miscentering may substantially

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“…However, recent research has demonstrated the potential use of dual-energy CT (DECT) and different tube voltage/ tube current protocols for the characterization of tissue components and organ perfusion as well as for dose reduction [5][6][7][8][9][10][11]. In addition there is evidence that suggests the usefulness of DECT for comprehensive imaging of coronary artery disease and the evaluation of myocardial perfusion [12,13].…”

Section: Introductionmentioning

confidence: 99%

Dose levels at coronary CT angiography—a comparison of Dual Energy-, Dual Source- and 16-slice CT

et al. 2010

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Purpose To compare the dose estimates and image quality of Dual Energy CT (DECT), Dual Source CT (DSCT) and 16-slice CT for coronary CT angiography (cCTA). Methods Sixty-eight patients were examined with 16 -slice MDCT (group 1), 68 patients with DSCT (group 2) and 68 patients using DSCT in dual energy mode (DECT group 3). CT dose index volume, dose length product, effective dose, signal-to-noise, and contrast-to-noise ratio were compared. Subjective image quality was rated by two observers, blinded to technique. Results The mean estimated radiation dose of all patients investigated on a 16 -slice MDCT was 12±3.59 mSv, for DSCT in single energy 9.8±4.77 mSv and for DECT 4.54± 1.87 mSv. Dose for CTA was significantly lower in group 3 compared to group 1 and 2. The image noise was significantly lower in Group 2 in comparison to group 1 and group 3. There was no significant difference in diagnostic image quality comparing DECT and DSCT. Conclusion cCTA shows better dose levels at both DECT and DSCT compared to 16-slice CT. Further, DECT delivers significantly less dose than regular DSCT or single source single energy cCTA while maintaining diagnostic image quality.

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Effect of Patient Size on Radiation Dose for Abdominal MDCT with Automatic Tube Current Modulation: Phantom Study

Abstract: Oversized patients undergoing abdominal MDCT with tube current modulation receive significantly higher doses than do small patients. The noise index needs to be adjusted to the body habitus to ensure dose efficiency.

Cited by 100 publications

References 12 publications

An education and training programme for radiological institutes: impact on the reduction of the CT radiation dose

An education and training programme for radiological institutes: impact on the reduction of the CT radiation dose

Impact of miscentering on patient dose and image noise in x-ray CT imaging: Phantom and clinical studies

Dose levels at coronary CT angiography—a comparison of Dual Energy-, Dual Source- and 16-slice CT

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