Objective To evaluate the impact of heart rate(HR)on the image quality of one-stop computed tomography angiogra-phy(CTA)of the head and neck,aorta and coronary artery with dual-source CT ECG-gated high-pitch.Methods A total of 172 patients underwent dual-source CT one-stop scan were continuously selected.The subjective image quality was graded on a 4-point scale by two radiologists blinded.Receiver operating characteristic(ROC)curve was performed to analyze the impact of HR on image quality.The patients were divided into high HR group(group A)and low HR group(group B)according to HR.The objective image quality was evaluated by CT value,signal-to-noise ratio(SNR)and contrast-to-noise ratio(CNR)in region of interest(ROI).Results HR≤64 beats/min coronary artery image quality were qualified.The aortic root score in group A was lower than that in group B(P＜0.05).The left cir-cumflex SNR in group B was higher than that in group A,but the difference was not statistically significant(P=0.05).The enhancement degree,SNR and CNR of all branches of residual coronary artery in group B were higher than those in group A,and the difference was statistically significant(P＜0.05).The attenuation of aortic root and carotid artery in group B was higher than that in group A,and the difference was statistically significant(P＜0.05).Conclusion One-stop CTA of the head and neck,aorta and coronary artery with dual-source CT ECG-gated high-pitch is feasible.To improve image quality,the patient's HR should be routinely controlled below 64 beats/min.

Objective To retrieve,evaluate and summarise the relevant evidence in non-pharmacological management of venous thromboembolism in patients with haemorrhagic stroke during perioperative period so as to provide references for clinical practice. Methods According to the "6S" evidence pyramid mode,evidence was retrieved from top to bottom across databases such as BMJ Best Practice,UpToDate,JBI Evidence-Based Healthcare Centre,the National Guideline Clearinghouse (NGC),the National Institute for Health and Care Excellence (NICE),the Scottish Intercollegiate Guidelines Network (SIGN),the Registered Nurses' Association of Ontario (RNAO) guidelines network,the Canadian Heart and Stroke Foundation (HSF),the American Heart Association/American Stroke Association (AHA/ASA),the Neuro-Critical Care Society (NCS),the European Stroke Organization (ESO),Cochrane Library,PubMed,Medline,CNKI,Web of Science,Embase,the China Biomedical Literature Database,Wanfang Data,Medlive,VIP,and the Chinese Medical Journal Full-Text Database. The search focused on non-pharmacological management of perioperative venous thromboembolism in haemorrhagic stroke patients,including guidelines for clinical practice,expert consensus,systematic reviews and evidence summaries. The searched literatrue was from the inception of the databases to April 11th,2024. Two researchers independently evaluated the quality of the literature,extracted,integrated and summarised the best evidences. Results A total of 23 articles were included,comprising 12 guidelines,5 systematic reviews,4 expert consensuses and 2 evidence summaries. Thirty-one pieces of the best evidence were summarised and integrated into 5 topics,including multidisciplinary teamwork,risk assessment and screening,basic prevention,mechanical prophylaxis and health education. Conclusion This study has summarised the best evidence for non-pharmacological management of venous thromboembolism in patients with haemorrhagic stroke during the perioperative period. It provides evidence-based references for clinical medical staff to prevent and manage venous thromboembolism in patients with hemorrhagic stroke during perioperative period.

Objective To retrieve,evaluate and summarise the relevant evidence in non-pharmacological management of venous thromboembolism in patients with haemorrhagic stroke during perioperative period so as to provide references for clinical practice. Methods According to the "6S" evidence pyramid mode,evidence was retrieved from top to bottom across databases such as BMJ Best Practice,UpToDate,JBI Evidence-Based Healthcare Centre,the National Guideline Clearinghouse (NGC),the National Institute for Health and Care Excellence (NICE),the Scottish Intercollegiate Guidelines Network (SIGN),the Registered Nurses' Association of Ontario (RNAO) guidelines network,the Canadian Heart and Stroke Foundation (HSF),the American Heart Association/American Stroke Association (AHA/ASA),the Neuro-Critical Care Society (NCS),the European Stroke Organization (ESO),Cochrane Library,PubMed,Medline,CNKI,Web of Science,Embase,the China Biomedical Literature Database,Wanfang Data,Medlive,VIP,and the Chinese Medical Journal Full-Text Database. The search focused on non-pharmacological management of perioperative venous thromboembolism in haemorrhagic stroke patients,including guidelines for clinical practice,expert consensus,systematic reviews and evidence summaries. The searched literatrue was from the inception of the databases to April 11th,2024. Two researchers independently evaluated the quality of the literature,extracted,integrated and summarised the best evidences. Results A total of 23 articles were included,comprising 12 guidelines,5 systematic reviews,4 expert consensuses and 2 evidence summaries. Thirty-one pieces of the best evidence were summarised and integrated into 5 topics,including multidisciplinary teamwork,risk assessment and screening,basic prevention,mechanical prophylaxis and health education. Conclusion This study has summarised the best evidence for non-pharmacological management of venous thromboembolism in patients with haemorrhagic stroke during the perioperative period. It provides evidence-based references for clinical medical staff to prevent and manage venous thromboembolism in patients with hemorrhagic stroke during perioperative period.

To examine the feasibility of using a computer tool for stratifying the severity of Coronavirus Disease 2019 (COVID-19) based on computed tomography (CT) images. We retrospectively examined 44 confirmed COVID-19 cases. All cases were evaluated separately by radiologists (visually) and through an in-house computer software. The degree of lesions was visually scored by the radiologist, as follows, for each of the 5 lung lobes:0, no lesion present;1,<1/3 involvement;2,>1/3 and<2/3 involvement;and 3,>2/3 involvement. Lesion density was assessed based on the proportion of ground-glass opacity (GGO), consolidation and fibrosis of the lesions. The parameters obtained using the computer tool included lung volume (mL), lesion volume (mL), lesion percentage (％), and mean lesion density (HU) of the whole lung, right lung, left lung, and each lobe. The scores obtained by the radiologists and quantitative results generated by the computer software were tested for correlation. A Chi-square test was used to test the consistency of radiologist- and computer-derived lesion percentage in the right/left lung, upper/lower lobe, and each of the 5 lobes. The results showed a strong to moderate correlation between lesion percentage scores obtained by radiologists and the computer software (r ranged from 0.7679 to 0.8373, P < 0.05), and a moderate correlation between the proportion of GGO and mean lesion density (r=-0.5894, P<0.05), and proportion of consolidation and mean lesion density (r=0.6282, P<0.05). Computer-aided quantification showed a statistical significant higher lesion percentage for lower lobes than that assessed by the radiologists (x2 = 8.160, P = 0.004). Our experiments demonstrated that the computer tool could reliably and accurately assess the severity and distribution of pneumonia on CT scans.

Objective To investigate the application value of low dose high pitch dual source CT angiography technique in diagno-sis of acute aortic dissection.Methods 21 cases of critically ill patients with suspected aortic dissection underwent total aortic angiog-raphy without using ECG by adopting the second generation dual source CT Flash Technology (pitch 3 .2 ,1 0 0 kV and 1 0 0 mAs), using a lower contrast dose (60 mL).Results All subjects accepted as low as possible radiation doses and iodine intake;at the same time,accurate information including aortic intimal tear position,intimal flap,true and false lumen,and lesions involving the range vessel signs and anatomic relationship were received,2 cases of Stanford type A,type B 1 9 cases (2 cases of aortic rupture).Average scan time 2.6 s,average effective radiation dose cm 270 mGy·cm.Conclusion High quality images by using high pitch dual source CT low dose angiography with lower contrast dose provide safe,reliable,real-time screening method for critically ill patients with aor-tic dissection caused by systemic severe compound injury.