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ScientificWorldJournal. 2013 Dec 23;2013:731590. doi: 10.1155/2013/731590. eCollection 2013.

Influence of image acquisition on radiation dose and image quality: full versus narrow phase window acquisition using 320 MDCT.

Author information

  • 1Department of Radiology, Emory University Hospital Midtown, Atlanta, GA, USA.
  • 2Department of Radiology, Beth Israel Deaconess Medical Center, Harvard University, Boston, MA, USA.
  • 3Department of Cardiology, Yale University School of Medicine, New Haven, CT, USA.
  • 4Department of Cardiology, Los Angeles Biomedical Research Institute, Torrance, CA, USA.
  • 5Department of Radiology, Brigham and Women's Hospital Harvard Medical School, Boston, MA, USA.

Abstract

PURPOSE:

To compare radiation dose and image quality using predefined narrow phase window versus complete phase window with dose modulation during R-R using 320-row MDCTA.

METHODS:

114 patients underwent coronary CTA study using 320-row MDCT scanner. 87 patients with mean age (61 + 13 years), mean BMI (29 + 6), and mean heart rate (HR) (58 + 7 bpm) were imaged at predefined 66-80% R-R interval and then reconstructed at 75% while 27 patients with mean age (63 + 16 years), mean BMI (28 + 5), and mean HR (57 + 7 bpm) were scanned throughout the complete R-R interval with tube current modulation. The effective dose (ED) was calculated from dose length product (DLP) and conversion k (0.014 mSv/mGy/cm). Image quality was assessed using a three-point ordinal scale (1 = excellent, 2 = good, and 3 = nondiagnostic).

RESULTS:

Both groups were statistically similar to each other with reference of HR (P = 0.59), BMI (P = 0.17), and tube current mAs (P = 0.68). The median radiation dose was significantly higher in those scanned with complete R-R phase window versus narrow phase window (P < 0.0001). Independently of patient and scan parameters, increased phase window was associated with higher radiation dose (P < 0.001). Image quality was better among those scanned with narrow phase window versus complete phase window (P < 0.0001).

CONCLUSION:

Our study supports that good HR control and predefined narrow window acquisition result in lower radiation dose without compromising diagnostic image quality for coronary disease evaluation.

PMID:
24453899
[PubMed - indexed for MEDLINE]
PMCID:
PMC3884853
Free PMC Article
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