Tags

Type your tag names separated by a space and hit enter

Effect of automatic tube current modulation on radiation dose and image quality for low tube voltage multidetector row CT angiography: phantom study.
Acad Radiol. 2009 Aug; 16(8):997-1002.AR

Abstract

RATIONALE AND OBJECTIVES

To evaluate the effect of automatic tube current modulation on radiation dose and image quality for low tube voltage computed tomography (CT) angiography.

MATERIALS AND METHODS

An anthropomorphic phantom was scanned with a 64-section CT scanner using following tube voltages: 140 kVp (Protocol A), 120 kVp (Protocol B), 100 kVp (Protocol C), and 80 kVp (Protocol D). To achieve similar noise, combined z-axis and xy-axes automatic tube current modulation was applied. Effective dose (ED) for the four tube voltages was assessed. Three plastic vials filled with different concentrations of iodinated solution were placed on the phantom's abdomen to obtain attenuation measurements. The signal-to-noise ratio (SNR) was calculated and a figure of merit (FOM) for each iodinated solution was computed as SNR(2)/ED.

RESULTS

The ED was kept similar for the four different tube voltages: (A) 5.4 mSv +/- 0.3, (B) 4.1 mSv +/- 0.6, (C) 3.9 mSv +/- 0.5, and (D) 4.2 mSv +/- 0.3 (P > .05). As the tube voltage decreased from 140 to 80 kVp, image noise was maintained (range, 13.8-14.9 HU) (P > .05). SNR increased as the tube voltage decreased, with an overall gain of 119% for the 80-kVp compared to the 140-kVp protocol (P < .05). The FOM results indicated that with a reduction of the tube voltage from 140 to 120, 100, and 80 kVp, at constant SNR, ED was reduced by a factor of 2.1, 3.3, and 5.1, respectively, (P < .001).

CONCLUSIONS

As tube voltage decreases, automatic tube current modulation for CT angiography yields either a significant increase in image quality at constant radiation dose or a significant decrease in radiation dose at a constant image quality.

Authors+Show Affiliations

Department of Diagnostic, Interventional and Pediatric Radiology, Inselspital, Bern University Hospital, University of Bern, Freiburgstrasse, Bern, Switzerland. sschindera@aol.comNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Evaluation Study
Journal Article

Language

eng

PubMed ID

19409820

Citation

Schindera, Sebastian T., et al. "Effect of Automatic Tube Current Modulation On Radiation Dose and Image Quality for Low Tube Voltage Multidetector Row CT Angiography: Phantom Study." Academic Radiology, vol. 16, no. 8, 2009, pp. 997-1002.
Schindera ST, Nelson RC, Yoshizumi T, et al. Effect of automatic tube current modulation on radiation dose and image quality for low tube voltage multidetector row CT angiography: phantom study. Acad Radiol. 2009;16(8):997-1002.
Schindera, S. T., Nelson, R. C., Yoshizumi, T., Toncheva, G., Nguyen, G., DeLong, D. M., & Szucs-Farkas, Z. (2009). Effect of automatic tube current modulation on radiation dose and image quality for low tube voltage multidetector row CT angiography: phantom study. Academic Radiology, 16(8), 997-1002. https://doi.org/10.1016/j.acra.2009.02.021
Schindera ST, et al. Effect of Automatic Tube Current Modulation On Radiation Dose and Image Quality for Low Tube Voltage Multidetector Row CT Angiography: Phantom Study. Acad Radiol. 2009;16(8):997-1002. PubMed PMID: 19409820.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of automatic tube current modulation on radiation dose and image quality for low tube voltage multidetector row CT angiography: phantom study. AU - Schindera,Sebastian T, AU - Nelson,Rendon C, AU - Yoshizumi,Terry, AU - Toncheva,Greta, AU - Nguyen,Giao, AU - DeLong,David M, AU - Szucs-Farkas,Zsolt, Y1 - 2009/05/05/ PY - 2008/12/17/received PY - 2009/02/24/revised PY - 2009/02/26/accepted PY - 2009/5/5/entrez PY - 2009/5/5/pubmed PY - 2009/9/23/medline SP - 997 EP - 1002 JF - Academic radiology JO - Acad Radiol VL - 16 IS - 8 N2 - RATIONALE AND OBJECTIVES: To evaluate the effect of automatic tube current modulation on radiation dose and image quality for low tube voltage computed tomography (CT) angiography. MATERIALS AND METHODS: An anthropomorphic phantom was scanned with a 64-section CT scanner using following tube voltages: 140 kVp (Protocol A), 120 kVp (Protocol B), 100 kVp (Protocol C), and 80 kVp (Protocol D). To achieve similar noise, combined z-axis and xy-axes automatic tube current modulation was applied. Effective dose (ED) for the four tube voltages was assessed. Three plastic vials filled with different concentrations of iodinated solution were placed on the phantom's abdomen to obtain attenuation measurements. The signal-to-noise ratio (SNR) was calculated and a figure of merit (FOM) for each iodinated solution was computed as SNR(2)/ED. RESULTS: The ED was kept similar for the four different tube voltages: (A) 5.4 mSv +/- 0.3, (B) 4.1 mSv +/- 0.6, (C) 3.9 mSv +/- 0.5, and (D) 4.2 mSv +/- 0.3 (P > .05). As the tube voltage decreased from 140 to 80 kVp, image noise was maintained (range, 13.8-14.9 HU) (P > .05). SNR increased as the tube voltage decreased, with an overall gain of 119% for the 80-kVp compared to the 140-kVp protocol (P < .05). The FOM results indicated that with a reduction of the tube voltage from 140 to 120, 100, and 80 kVp, at constant SNR, ED was reduced by a factor of 2.1, 3.3, and 5.1, respectively, (P < .001). CONCLUSIONS: As tube voltage decreases, automatic tube current modulation for CT angiography yields either a significant increase in image quality at constant radiation dose or a significant decrease in radiation dose at a constant image quality. SN - 1878-4046 UR - https://www.unboundmedicine.com/medline/citation/19409820/Effect_of_automatic_tube_current_modulation_on_radiation_dose_and_image_quality_for_low_tube_voltage_multidetector_row_CT_angiography:_phantom_study_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1076-6332(09)00179-2 DB - PRIME DP - Unbound Medicine ER -