Prospective and retrospective ECG gating for thoracic CT angiography: a comparative study.

Content Provider	Semantic Scholar
Author	Wu, Wenhui Budovec, Joseph J. Foley, W. Dennis
Copyright Year	2009
Abstract	OBJECTIVE The objective of our study was to compare radiation dose, contrast load, thoracic aortic attenuation value, and image quality parameters of MDCT thoracic aortography performed with prospective and retrospective cardiac gating. MATERIALS AND METHODS Studies were performed on 80 patients (prospective ECG gating, n = 40; retrospective ECG gating, n = 40) either being evaluated for thoracic aortic aneurysm (n = 23) or aortic dissection (n = 36) or undergoing postsurgical or postintervention follow-up (n = 21). Image acquisition parameters and radiation dose (CT dose index volume [CTDI(vol)] and dose-length product [DLP]) were obtained from image archival data. Contrast load and aortic attenuation values were obtained from a data registry. The comparative degrees of motion artifact and banding artifact were assessed on parasagittal maximum-intensity-projection (MIP) images and reformatted images in the plane of the aortic valve. RESULTS CTDI(vol) and DLP in the prospective ECG-gating group was 28.8 +/- 2.12 mGy (mean +/- SD) and 833.7 +/- 115.77 mGy/cm, respectively, which are significantly lower (p < 0.001) than those values in the retrospective ECG-gating group (74.7 +/- 13.42 mGy and 2,547.3 +/- 553.27 mGy/cm). The average contrast load in the prospective gating group was 109.1 +/- 14.74 mL and in the retrospective gating group, 101.3 +/- 10.45 mL (p < 0.05). The average aortic attenuation values (in Hounsfield units) for the prospective and retrospective ECG-gated groups were 447.6 and 350.2 HU, respectively, for the mid ascending aorta, 413.6 and 325.7 HU for the mid aortic arch, 418.2 and 327.6 HU for the mid descending aorta, and 355.0 and 306.2 HU for the supraceliac aorta. Subjective scores of motion artifact and banding artifact were equivalent between the two groups. CONCLUSION Compared with retrospective ECG-gated thoracic CT angiography, prospective ECG-gated thoracic CT angiography was associated with a lower radiation dose, slightly increased contrast load, increased aortic attenuation values, and equivalent image quality.
Starting Page	133
Ending Page	139
Page Count	7
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://blogg.hioa.no/victdel4/files/2015/05/ekg-gated-aortaWenhui-Wu.pdf
PubMed reference number	19770316v1
Alternate Webpage(s)	https://doi.org/10.2214/AJR.08.2158
DOI	10.2214/ajr.08.2158
Journal	AJR. American journal of roentgenology
Volume Number	193
Issue Number	4
Language	English
Access Restriction	Open
Subject Keyword	Aortic Aneurysm Aortic Aneurysm, Thoracic Aortic arch structure Aortic valve structure Aortography Ascending aorta structure Chest Descending aorta Dissecting aneurysm of the thoracic aorta Dissection of aorta Dose Length Product Eighty Patients Physiological Sexual Disorders Projection Defense Mechanism Registries X-Ray Computed Tomography angiogram
Content Type	Text
Resource Type	Article