Simultaneous acquisition of CT angiography and who

Authors: Weiwei Chen Jianpin Qi Wenzhen Zhu Wenhua Huang Jinmei Song

Publish Date: 2009/04/02

Volume: 3, Issue: 2, Pages: 230-235

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Abstract

We implemented a new protocol—multiphase dynamic helical scan to acquire CT angiography CTA and whole brain CT perfusion CTP images simultaneously with single scan on 16 multidetector CT MDCT A total of 90 patients who were randomly assigned into 3 groups were included in our study Each group underwent CT scan by using the new protocol traditional CTA and CTP protocol respectively The image quality of CTA the CTP parameter values and the Xray doses were measured and compared between the new protocol and the traditional protocols There was no statistically significant difference in the CTA image quality between the above methods P = 055 For CTP parameters the new protocol tended to overestimate the blood volume BV and blood flow BF value and to underestimate the mean transit time MTT value compared with the traditional method However there was no statistically significant difference in BV BF and MTT value between the two methods except permeability surface PS P005 The volume CT dose index CTDIvol and dose length product DLP of our protocol were lower than the traditional one The new protocol can obtain valuable diagnostic information in a shorter time without significant compromise in image quality In addition it reduces the radiation dose as well as contrast medium usage on the patient

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