64排VCT XT冠脉低剂量扫描技术对诊断效果的影响

目的：评价64排VCT XT冠状动脉成像中前门控点射式轴位扫描对图像质量的影响及应用价值，探讨低剂量CCTA检查的临床应用效果。方法：筛选100例行冠脉前瞻性门控轴位扫描的患者，根据患者体重指数（body mass index．BMI）选择管电流为180～800mA，管电压为100～120kV。记录扫描中患者所受射线剂量，并将其与回顾性门控扫描参数进行模拟计算剂量对比，采用SPSS10．0软件对其图像质量进行对比评价（5分优，1分差）。结果：在相同管电压条件下，前门控射线剂量（平均2．27msv）远远低于回顾性心电门控（平均14．15msv）。两种扫描方式下，图像质量和诊断效果没有显著性差异。结论：64排VCT XT采用的前门控扫描技术及个性化的扫描参数，能够在大大降低射线剂量（至少75％）的同时获得满足临床诊断需要的图像质量及诊断效果。

GE Lightspeed VCT 64排螺旋CT故障排除1例

1故障现象每次启动扫描时,扫描桌面状态区均红字显示：＂The detector is not theproper temperature,detector temperatureis high,if continue to scan,the imagequality may be affected.＂,即：探测器温度不在正常范围内,温度较高,如果继续扫描,图像质量可能会受到影响。如果忽视此错误继续扫描,则扫描3~5名患者后状态区显示：＂DAS Digital ModuleTemperature Out of Tolerance,the detec-tor temperature is too high,the scan is notallowed.＂

64排VCT泌尿系成像中应用利尿剂的初步研究

目的研究注射小剂量利尿剂后的64排VCT泌尿系成像（CTU）可行性。方法对50例有泌尿系疾病的患者行64排VCT泌尿系成像。50例患者中，24例行传统方法CTU检查，26例在注入对比剂前3～5min注射速尿10mg，然后用64排VCT做Ⅲ期增强扫描以获取泌尿系整体图像。结果64排VCT泌尿系成像结合小剂量利尿剂使26例患者中的23例（88％）输尿管和26例（100％）肾盂肾盏系统近乎完全或完全显影。结论64排VCT泌尿系成像结合小剂量利尿剂可获得整个尿路的清晰影像，且无需患者憋尿，具有可行性。

GE LightSpeed VCT 64排螺旋CT硬盘故障维修1例

Light Speed VCT是GE公司生产的高端CT产品,它真正开创了容积CT的新时代,是目前速度较快、精度较高的CT。在LightSpeed VCT机上,1s可扫描完成1个器官,5s完成心脏冠状动脉扫描,10s就可以完成全身扫描，扫描时间与16排CT相比，缩短了4倍，造影剂用量减少了一半，

浅谈64排VCT故障与分析

随着当前医疗技术的日益发展,64排螺旋CT的应用极大地提高了影像学在临床上的地位,充分显示出其在疾病诊断方面的价值[1]。本文就GE 64排VCT 2例故障检修进行简单的论述。1故障一1.1故障现象定位结束,＂曝光键＂亮起,按下后中断扫描,＂进床键＂亮起,反复几次,

小肠肿瘤的数字化胃肠道造影和64排VCT检查的对比分析

目的:通过对小肠肿瘤的数字化胃肠道造影和64排螺旋CT检查的影像表现进行对比分析,探讨两者结合对小肠肿瘤的诊断价值。方法:20例疑小肠肿瘤的患者均行数字化胃肠道造影和64排VCT检查,对比分析两者影像表现并与术后病理结果对照。结果:小肠腺瘤6例,腺癌5例,间质瘤3例,转移癌2例,肠叠1例(术前诊为癌),淋巴瘤2例,侵及相邻组织器官3例,淋巴结肿大8例。结论:数字化胃肠道造影和64排螺旋CT检查对比分析能较好显示小肠病变,并判断良恶性,为临床治疗提供有价值的信息。

64排VCT脑灌注成像对烟雾病的血流动力学研究

目的通过对烟雾病患者进行64排VCT脑灌注成像,了解其脑血流动力学变化情况,包括脑血流量、脑血容量、平均通过时间及达峰时间,为临床干预治疗提供影像学依据。方法 30例烟雾病患者,男性14例,女性16例,年龄最大为49岁,最小为13岁,平均年龄为33.8岁。利用GE公司生产的LightSpeed VCT螺旋扫描机对烟雾病患者进行灌注扫描,速率5mL·s-1、剂量50mL、扫描延迟5s、扫描时间45s,然后用该公司配备的Perfusion4专门软件对所得图像进行后处理,分析责任区域的脑血流量、脑血容量、平均通过时间及达峰时间,从而了解其血流动力学变化情况。结果 30例烟雾病患者当中,缺血型患者9例,出血型患者21例。3例显示局部脑血流量增加,5例显示局部脑血流量减少,3例显示局部脑血容量增加,27例显示脑血容量正常,3例显示平均通过时间及达峰时间缩短,8例显示平均通过时间及达峰时间延长。结论缺血型烟雾病患者大部分表现为局部低灌注,出血型烟雾病患者表现为正常或局部高灌注,平均通过时间和达峰时间是反映脑血流动力学变化较敏感的指标。

GE 64排VCT准直器故障一例

GElightspeed64排VCT机扫描初期停止的故障是比较常见的一种故障现象，出现这种现象的原因有很多，但大多数都属于软故障，通常关闭电源，重新启动机器，大多可以得到解决。但是关机重启后问题无法解决，我们应该怎样去查找故障的原因，用什么方法解决故障。现就我科近期发生一例CT机扫描停止的故障检修为例，对此类故障进行分析，仅供参考。

64排VCT低电压扫描技术在头颈联合CTA检查中的意义

目的观察64排VCT低电压扫描技术用于头颈部联合CTA检查的效果并进一步探讨其临床意义。方法将66例头颈部血管成像受检者随机分成A、B两组,A组30例,B组36例,其中A组采用常规曝光条件(120k V,400m As),B组采用低电压技术(100k V,400m As)。对两组受检者动脉血管的显影强度、图像噪声、头颈部动脉血管图像质量以及辐射剂量进行分析评价。结果 B组图像血管的显影强度(CT平均值)、图像噪声较A组略高,但两组检查的图像质量分级无统计学意义;而B组的辐射剂量较A组明显降低,B组头颈部联合CTA检查的平均辐射剂量(3.16m Gy)比A组(4.92m Gy)约降低36%。结论应用64排VCT头颈部联合CTA低剂量扫描技术,能够在保证图像质量的前提下降低患者所接受的辐射剂量,是一种较有临床意义的影像学检查方法。

GE Light Speed VCT XT 64层螺旋CT故障维修2例

0引言GE公司生产的Light Speed VCT XT是一台可用于身体各部位常规扫描、增强扫描及心脏大血管造影扫描的64层螺旋CT。由于此机型较为成熟稳定且用途广泛，所以设备保有量较高。在使用过程中因温度、电源等多种因素会引起各种故障，

64层VCT对外中内耳结构的重建成像探讨

目的:探讨64层螺旋容积扫描(简称VCT)对双耳重度感音性耳聋患者外耳、中耳、内耳立体影像的人工耳蜗植入术前重建。方法:利用64层VCT对19例双耳重度感音性耳聋患者进行了容积扫描及外耳、中耳、内耳影像结构的立体重建。结果:容积扫描及重建的速度快,重建出清晰的外耳、中耳、内耳的结构。结论:64层VCT的容积重建技术可以清楚的显示人工耳蜗植入时所要观察到的外耳道后壁,面神经管走行,砧骨短脚,外半规管,面神经隐窝,镫骨肌腱,鼓岬,圆窗龛,鼓阶,骨迷路及膜迷路。

Observation of the effect of targeted therapy of 64-slice spiral CT combined with cryoablation for liver cancer

AIM to observe the effect of targeted therapy with 64-slice spiral computed tomography (CT) combined with cryoablation for liver cancer. METHODS A total of 124 patients ( 142 tumors) were enrolled into this study. According to the use of dual-slice spiral CT or 64-slice spiral CT as a guide technology, patients were divided into two groups: dual-slice group (n = 56, 65 tumors) and 64-slice group (n = 8, 77 tumors). All patients were accepted and received targeted therapy by an argon-helium superconducting surgery system. The guided scan times of the two groups was recorded and compared. In the two groups, the lesion ice coverage in diameter of >= 3 cm and < 3 cm were recorded, and freezing effective rate was compared. Hepatic perfusion values [ hepatic artery perfusion (HAP), portal vein perfusion (PVP), and the hepatic arterial perfusion index (HAPI)] of tumor tissues, adjacent tissues and normal liver tissues at preoperative and postoperative four weeks in the two groups were compared. Local tumor changes were recorded and efficiency was compared at four weeks post-operation. Adverse events were recorded and compared between the two groups, including fever, pain, frostbite, nausea, vomiting, pleural effusion and abdominal bleeding. RESULTS Guided scan times in the dual-slice group was longer than that in the 64-slice group (t = 11.445, P = 0.000). The freezing effective rate for tumors < 3 cm in diameter in the dual-slice group (81.58%) was lower than that in the 64-slice group (92.86%) (chi(2) = 5.707, P = 0.017). The HAP and HAPI of tumor tissues were lower at four weeks post-treatment than at pretreatment in both groups (all P < 0.05), and those in the 64-slice group were lower than that in the dual-slice group ( all P < 0.05). HAP and PVP were lower and HAPI was higher in tumor adjacent tissues at post-treatment than at pre-treatment ( all P < 0.05). Furthermore, the treatment effect and therapeutic efficacy in the dual-slice group were lower than the 64-slice group at four weeks post-treatment (all P < 0.05). Moreover, pleural effusion and intraperitoneal hemorrhage occurred in patients in the dual-slice group, while no complications occurred in the 64-slice group (all P < 0.05). CONCLUSION 64-slice spiral CT applied with cryoablation in targeted therapy for liver cancer can achieve a safe and effective freezing treatment, so it is worth being used.

GE lightspeed VCT 64排螺旋CT机ADW4.4图像后处理工作站黑屏的维修

随着社会经济的迅猛发展,医院诊疗用的大型设备的配置也在不断提高[1],我科在2009年配置了GE lightspeed VCT 64排螺旋CT机,并随机配备了先进的ADW4.4图像后处理工作站,但近期该工作站显示器时常出现黑屏现象,严重影响设备的应用。现将ADW4.4图像后处理工作站显示器黑屏故障维修过程报道如下,以供参考。

64排VCT冠状动脉造影的临床诊断价值

选择性冠状动脉造影是诊断冠心病的金标准，但其费用高、创伤大、存在潜在危险，不适用于所有患者，而64排VCT以其扫描速度快、经济、安全无创，且有很高的空间分辨率和时间分辨率．基本能满足冠状动脉的检查，已成为冠状动脉造影检查的首选。为此，笔者结合临床资料就64排VCT冠状动脉造影（CTA）在冠状动脉病变中的诊断价值探讨如下。

Clinical Effect of Magnetic Resonance Imaging and 64-slice Spiral CT in the Diagnosis of Ischemic Heart Disease Patients

Objective:To explore the clinical methods and clinical effects of applying magnetic resonance imaging(MRI)and 64・slice spiral computed tomography(CT)in the diagnosis of patients with ischemic heart disease.Methods:100 patients with ischemic heart disease were selected as the research objects.Selecting the patients from May 2020 to May 2021 as a sample,the patients were divided into two groups,and different diagnostic methods were used to compare the clinical diagnosis effects.Results:In terms of the diagnostic accuracy of the two groups of patients,the maximum value was 92.00%(experimental group)and the minimum value was 80.00%(control group).There was a big difference in data between the two groups,P<0.05,which was statistically significant.The patient9s(experimental group)diagnosis accuracy rate is highe Conclusion:In the process of research work for patients with ischemic heart disease,it is particularly important to diagnose the patients.The combined application of and 64-slice spiral CT can improve the clinical diagnosis efficiency and achieve significant results.

64排128层VCT后处理技术在脊椎结核检查的应用探讨

目的探讨64排128层VCT后处理技术在脊椎结核检查的应用。方法 106例脊椎结核患者进行GE 64排128层VCT扫描,经AW 4.4图像后处理工作站进行多平面重建(MPR)和三维重建处理观察椎体、椎旁及椎管的病变。结果 106例患者中椎体骨质破坏106例,死骨形成106例,椎旁脓肿75例,椎间盘破坏95例,椎体压缩椎管狭窄42例,钙化55例。结论后处理技术在显示椎体破坏方式、椎间盘破坏、椎旁脓肿范围、椎管侵犯情况方面优于常规横断位图像,在脊椎结核的诊断治疗及为临床手术提供了丰富的影像信息。

GE64排VCT机扫描初期停止故障及解决方法分析

GE64排VCT机扫描初期的停止故障与设备控制板存在的问题之间存在着一定的联系。本文主要对GE64排VCT机扫描初期停止故障的表现及解决方法进行了分析。

Predictive Factors of the Presence and Number of Noncalcified Coronary Plaque in Japanese Patients with Zero Coronary Artery Calcium Score Using 64-Slice Multi-Detector Computed Tomography

Background: Factors that can predict the presence and number of noncalcified coronary plaques (NCP) in Japanese patients with zero coronary artery calcium scores (CACS) essentially remain undefined. Methods and Results: We assessed independent predictors of the presence and number of segments with NCP in 111 Japanese patients with zero CACS who underwent 64-slice multi-detector computed tomography at our hospital. Thirty five patients (32%) had NCP, and 24 patients (22%) had ≥ 2 NCPs. Multiple logistic regression analysis revealed that significant predictors for the presence of NCP were age (odds ratio [OR]: 1.06, 95% confidence interval [CI] 1.01 - 1.11, p = 0.021), male (OR: 3.61, 95% CI 1.40 - 9.35, p = 0.008) and diabetes mellitus (OR: 3.10, 95% CI 1.02 - 9.45, p = 0.046), and those for the presence of ≥ 2 NCPs were age (OR: 1.08, 95% CI 1.02 - 1.15, p = 0.007) and a current smoking habit (OR: 5.09, 95% CI 1.00 - 25.74, p = 0.049). Multiple linear regression analysis identified advanced age, male gender and diabetes mellitus as independent predictors of the number of NCPs. A novel score calculated from the above four predictors showed moderate accuracy for a diagnosis of NCP and ≥ 2 NCPs, with areas under receiver operating curves of 0.738 and 0.736, respectively. Conclusions: Male Japanese patients with zero CACS, advanced age, diabetes mellitus and a current smoking habit might have NCPs.

GE LightSpeed 64排VCT

我院于2007年底引进GE LightSpeed64排VCT。该机扫描速度快，可保证运动器官（如心脏和冠状动脉）清晰成像，对诊断冠状动脉变异、冠心病、先天性心脏病、心肌病以及一些心脏占位性病变具有良好的效果。强大的后处理软件可以多种方式、多角度展示病变特点，弥补了普通螺旋CT只能横断面观察病变的不足。

Imaging Effect and Accuracy Analysis of 64-Slice Spiral CT in the Diagnosis of Coronary Artery Stenosis

Objective:To analyze the imaging effect and accuracy of 64-slice spiral CT in the diagnosis of coronary artery stenosis.Methods:30 patients with suspected coronary heart disease admitted to our hospital from March 2022 to March 2023 were selected.All patients underwent both 64-slice spiral CT and digital subtraction angiography(DSA).DSA is considered the gold standard for diagnosis,so it was used to analyze the diagnostic performance of 64-slice spiral CT.Results:(1)The diagnostic results of digital subtraction angiography and 64-slice spiral CT was analyzed and compared with each other.The 64-slice spiral CT had an accuracy of 96.67%(29/30),a sensitivity 96.55%(28/29),and a specificity of 100.00%(1/1)in diagnosing coronary artery stenosis.(2)There was no significant difference between 64-slice spiral CT and digital subtraction angiography in the positive detection rate of anterior descending artery lesion,the positive detection rate of left main lesion,the positive detection rate of left circumflex artery lesion and the positive detection rate of right coronary artery lesion(P>0.05).(3)There was no significant difference between 64-slice spiral CT examination and DSA examination in identifying mild stenosis,moderate stenosis,and severe stenosis of coronary arteries(P>0.05).Conclusion:64-slice spiral CT examination can accurately determine the degree of occlusion of coronary arteries,which allows for the accurate diagnosis of coronary artery stenosis.