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20 th ISRRT World Congress 2018<br />
Hosted by<br />
Website: www.isrrt2018.org.tt<br />
Email: queries@isrrt2018.org.tt<br />
Conclusion: The ESD was significantly reduced during the low-dose CT examination with bismuth shielding, but it<br />
notably increased the image noise. X-CARE reduced the ESD minimally compared to the CT low-dose scans, <strong>and</strong> it<br />
also increased the image noise. The most efficient way to achieve an optimal thoracic CT examination is to use a<br />
st<strong>and</strong>ard low-dose protocol.<br />
EDUCATION, MANAGEMENT, PROFESSIONALISM<br />
Study on Cerebral Blood Flow of Youth Auditory Cortex under different frequent sound<br />
stimulation using Arterial Spin Labeling Perfusion Weighted Imaging.<br />
Xiaojing Zhang<br />
Chinese PLA General Hospital, China<br />
P3<br />
Introduction: Auditory center is an important structure of brain, the perfusion of auditory center is related to auditory<br />
function. The purpose is to study the changes of cerebral blood flow (CBF) of auditory cortex under stimulation of<br />
different frequency of sound using arterial spin labeling (ASL) perfusion weighted imaging.<br />
Methods: 13 volunteers were examined using the GE Discovery 750 3.0Tesla MR system with 32 channels head coil.<br />
The whole brains were scanned with 3D FSPGR. Non-stimulation ASL, under low, middle <strong>and</strong> high frequency sound<br />
to bilateral ears were acquired respectively. All the data were transferred to adw4.6 work station. CBF values of auditory<br />
cortex were measured. Paired t-test was performed with SPSS17.0 statistical software.<br />
Results: The CBF value of right temporal lobe was 73.31±10.99ml/min/100g with non-stimulation. The left was<br />
73.10±10.72 ml/min/100g. There was no significant difference (p>0.05). The CBF values of left temporal lobe<br />
were74.33 ±11.76, 76.03±10.14 <strong>and</strong> 73.17±11.85 ml/min/100g corresponding to stimulating right ear with low, middle<br />
<strong>and</strong> high frequency sound. The CBF of right temporal lobe were70.46±11.52, 70.92±11.03 <strong>and</strong> 67.71±10.60<br />
ml/min/100g corresponding to stimulating right ear with low, middle <strong>and</strong> high frequency sound. The CBF of left temporal<br />
with stimulation to right ear were higher than those of right (p
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