Quantification of Fat Concentration and Vascular Response in Brown and White Adipose Tissue of Rats by Spectral CT Imaging

A study on radiation dose and image quality of chest spectral imaging and conventional CT in anthropomorphic phantom / 中华放射医学与防护杂志

Objective To obtain the parameters of optimal spectral scanning mode in chest spectral CT imaging,radiation doses,image quality,CNR and subjective scores are compared in spectral and conventional scan modes with anthropomorphic chest phantom.Methods An anthropomorphic chest phantom underwent both conventional scan and spectral scan using three different protocols:GSI assist mode (protocol A);GSI mode with mean tube current (protocol B);GSI mode with maximum tube current (protocol C).All above scans were performed with the noise index (NI) as 9 and 11 respectively.The radiation dose was recorded,and the SD values of adipose tissue and muscle tissue of 5 different sections were measured in regions of interest (ROls) to evaluate the image quality.All scans were subjectively scored in 5 score system by two senior radiologists on lung markings and branches with the lung window technique.Results The effective dose (E) values of conventional CT scan and protocols A,B and C were 8.0,8.5,6.2,10.4 and 5.3,5.1,4.3,6.2 mSv.When NI =9,the difference of SD values had statistically significance between conventional scan and protocols A,C (F =4.496,P ＜ 0.05).When NI =11,there was statistically significant difference of SD value between conventional scan and protocols A,B,C (F =8.425,P ＜ 0.05).In conventional chest scan,the difference of SD values was statistically significant between NI =9 and 11 (t =-2.570,P ＜ 0.05),while other protocols had no statistically significant difference (P ＞ 0.05).The difference of CNR and subjective score had no statistically significance in either the same NI different scanning modes or the same scanning mode with different NIs.Conclusions Appropriate spectral scanning mode had no significant difference with conventional CT scanning in radiation dose,yet higher image quality can be obtained.Furthermore,appropriate NI can reduce the radiation dose obviously while the similar image quality was achieved.Considering the two factors,GSI assist mode can achieve balance between radiation dose and image quality.

The use of multi-slice spiral CT angiography for hemoptysis / 中华放射学杂志

Objective To evaluate the nse of CT angiography in the diagnosis of hemoptysis and guiding the treatment of it with 64-slice spiral CT.Methods Twenty-two patients with repeated and massive hemoptysis underwent chest CT angiography.Results The blood supply of hemoptysis was nonbronchial systemic arteries in 3 patients,single or multiple bronchial arteries in 15 patients,mixed arteries of nonbronchial systemic and bronchial arteries in 3 patients and abnormal systemic arteries in 1 patient.Conclusion With 64-slice spiral CT,CT angiography provided useful information for the treatment of hemoptysis by guiding bronchial arterial embolization.

急性脑卒中后吞咽障碍的康复 / 中国康复理论与实践

@#目的探讨对急性脑卒中后吞咽障碍的康复。方法急性脑卒中后吞咽障碍的患者52例,对其中26例患者在给予药物治疗的同时,按不同程度制定不同的训练计划。对照组仅进行神经内科常规治疗和护理。结果对内囊以及以上部位病损引起的吞咽障碍,观察组康复效果好,多在10天内改善,优于对照组。结论急性脑卒中后吞咽障碍患者接受康复护理,能改善吞咽功能。