Objective: To compare and analyze the image quality and radiation dose of three scanning modes of dual-source CT coronary artery retrospectively, and to discuss the application value of TurboFlash coarse pitch scannin...Objective: To compare and analyze the image quality and radiation dose of three scanning modes of dual-source CT coronary artery retrospectively, and to discuss the application value of TurboFlash coarse pitch scanning mode. Methods: The imaging data of 100 patients who underwent CT coronary angiography (CCTA) using Siemens force CT retrospective gated triggering spiral scan (RES-SPIRAL), adaptive prospective gated triggering sequence scan (SEQ) and prospective coarse pitch scan (TurboFlash) retrospectively was collected. The image quality was evaluated by objective and subjective methods. The effective radiation dose of patients was compared and analyzed, and the indications of the three scanning modes were analyzed. The application value of dual-source CT TurboFlash coarse pitch scanning in coronary artery imaging was evaluated. Results: The results showed that the left main coronary artery, the right coronary artery and their tertiary branches could be clearly displayed in the three groups of images: the left anterior descending branch, the left circumflex branch, and their three-level branches. There was no statistical difference in subjective image quality among the three groups of pictures (P > 0.05). There was no statistical difference in objective evaluation indexes, such as CT value, SNR, CNR and Noise among the three groups (P > 0.05). The patient radiation dose results showed that the effective radiation dose ED of RES-SPIRA scan was (9.22 ± 1.33) mSv. The dose of SEQ was (2.88 ± 2.47) mSv, and the dose of TurboFlash was (0.51 ± 0.16) mSv. There was significant difference in comparison of the three groups (P 0.05). RES-spiral scanning had the highest radiation dose and TurboFlash coarse pitch scanning (TurboFlash) had the lowest radiation dose. Conclusion: TurboFlash coarse pitch scanning is low in dosage, fast in speed and wide in adaptability. It is especially suitable for the elderly, children, coma and other patients who cannot cooperate with breath-holding examination, as well as for the screening and examination of coronary artery diseases in asymptomatic population. Undoubtedly, it is a worthy method of heart coronary artery examination.展开更多
Objective: To explore the significance of dual-energy CT non-linear fusion technique in improving the quality of CTA image of renal cancer. Methods: The CTA images of 100 patients who had been confirmed by pathology a...Objective: To explore the significance of dual-energy CT non-linear fusion technique in improving the quality of CTA image of renal cancer. Methods: The CTA images of 100 patients who had been confirmed by pathology as renal cancer were collected and were randomly divided into experimental group and control group with 50 cases respectively. The two groups of patients were treated with iodine concentration of 300 mg/ml and 350 mg/ml non-ionic contrast agent, with a dosage of 1.5 ml/kg and an injection rate of 4 ml/s. The contrast agent intelligently tracking method was adopted bolus. The control group used the conventional CTA scanning, with a reference tube voltage/tube current of 100 kv/ref150 mas. The experimental group adopted the double energy scanning, with ball tube A and ball tube B. The reference tube voltage/tube current was 100 kv/ref250 mas and sn150 kv/ref125 mas respectively. The images of the experimental group were non-linear fused to obtain the Mono+ 55 kev single-energy images. The CT value, SNR contrast ratio of the abdominal aorta, renal artery and tumor tissue of the experimental group images and the 100 KV images and the Mono+ 55 kev images of the control group were compared. The objective evaluation and subjective evaluation of the image quality of the three groups of images was performed. Results: The results showed that the 100 kV images of the experimental group were statistically different from those of the control group (P05) in CT value, SNR and CNR (P 0.05). And there was no statistically significant difference between the non-linear fusion single-energy Mono+ 55 kev images and the control group images in CT value, SNR and CNR (P > 0.05). The subjective evaluation of image quality showed that there was no significant difference between Mono+ 55 kev images and control group images, and the quality of Mono+ 55 kev images was higher than that of experimental group 100 kV images. Conclusion: The dual-energy CT non-linear fusion technique can improve the quality of CTA image in patients with renal cancer, and it is possible to obtain high quality CTA images with low iodine concentration contrast agent.展开更多
Purpose: To explore the significance of dual-source computed tomography (DECT) virtual monoenergetic reconstructions technology in improving image quality for portal vein system of pancreatic cancer patients. Material...Purpose: To explore the significance of dual-source computed tomography (DECT) virtual monoenergetic reconstructions technology in improving image quality for portal vein system of pancreatic cancer patients. Materials and methods: 47 patients with clinically suspected pancreatic cancer (all confirmed by pathology) were collected. Routine plain scan was performed with Siemens Force dual-source dual-energy CT followed by 3 scans respectively carried out in arterial phase, portal phase and delayed phase. Traditional virtual monoenergetic reconstructions (Mono_E) and new generation of virtual monoenergetic reconstructions (Mono+) were respectively performed on portal vein images to obtain virtual single energy images including Mono_ E70 keV, Mono_E 55 keV and Mono+ 70 keV and Mono+ 55 keV. The signal-to-noise ratio (SNR) and noise of portal vein, normal pancreatic tissues and pancreatic lesions of 100 kV, Mono_E and Mono+ images were compared. In addition, the contrast noise ratio of portal vein and lesions as well as pancreatic tissues and lesions (CNR PV, CNRtumor) were also compared. At the same time, two imaging physicians with rich clinical experiences read the films and scored the images of each group by using the 5-point scoring method. Results: Mono+ 55 keV images including SNRpv, SNRpanc, SNRtumor, Noise, CNRpv, CNRtumor were statistically different from 100 KV images and Mono_E images (P < 0.05). As for the subjective score, Mono+ 55 keV image score also had the highest score, which had statistical significance (P < 0.05). The results showed that Mono+ 55 keV images had the best quality. Conclusion: The new generation of virtual Mono+ post-treatment can reduce image noise. Low energy Mono+ images can improve the contrast between pancreatic cancer lesions and portal of pancreatic cancer patients.展开更多
目的:分析多层螺旋CT(multi-slice spiral CT,MSCT)在胰腺浆液性微囊腺瘤(serous microcystic adenoma of the pancreas,SCAP)、胰腺乏血供神经内分泌肿瘤(pancreatichypo-vascularizedneuroendocrinetumors,hypo-PNETs)中的鉴别效果与...目的:分析多层螺旋CT(multi-slice spiral CT,MSCT)在胰腺浆液性微囊腺瘤(serous microcystic adenoma of the pancreas,SCAP)、胰腺乏血供神经内分泌肿瘤(pancreatichypo-vascularizedneuroendocrinetumors,hypo-PNETs)中的鉴别效果与其影像特点。方法:回顾性分析2021年8月—2022年8月莒县碁山镇卫生院收治的经病理检查证实的78例SCAP与hypo-PNETs患者的临床资料,全部患者均进行MSCT检查,以病理检查结果为“金标准”,统计MSCT检查的诊断符合率;另分析SCAP与hypo-PNETs的影像特点差异。结果:病理检查显示:78例患者中,SCAP共40例,hypo-PNETs共38例。MSCT检查共检出39例SCAP,38例hypoPNETs,总诊断符合率为98.72%(77/78);hypo-PNETs边界不清占比为77.50%(31/40)、无纤维间隔占比为80.00%(32/40)、动脉期强化占比为87.50%(35/40)、无浮云征占比为75.00%(30/38)、有转移或侵犯占比为80.00%(32/40),高于SCAP患者的21.05%(8/38)、26.32%(10/38)、44.74%(17/38)、26.68%(9/38)、0.00%,差异有统计学意义(P<0.05);而两者的部位、形态、胰管扩张、密度、钙化情况相比,差异无统计学意义(P>0.05)。结论:MSCT在SCAP、hypo-PNETs鉴别诊断中效果显著,而SCAP、hypo-PNETs两者的影像学特点存在较大差异,可为临床提供可靠的参考,值得临床大力推广。展开更多
目的探究颈部血管彩超(CVUS)及颈部CT血管造影术(CTA)联合CT脑灌注成像(CTP)对急性脑梗死合并脑血管狭窄或闭塞的诊断价值。方法选取2018年1月至2019年4月在韩城市人民医院神经内科治疗的急性脑梗死患者54例作为研究对象,采用数字减影...目的探究颈部血管彩超(CVUS)及颈部CT血管造影术(CTA)联合CT脑灌注成像(CTP)对急性脑梗死合并脑血管狭窄或闭塞的诊断价值。方法选取2018年1月至2019年4月在韩城市人民医院神经内科治疗的急性脑梗死患者54例作为研究对象,采用数字减影血管造影(DSA)、CVUS、CTA、CTP检查(DSA为检查金标准),重建获取图像,比较病侧区、健侧对照区CTP参数脑灌注值、强化峰值(PE)、达峰时间(TTP)、脑血容量(CBV),并对比分析不同检查方法对脑血管狭窄或闭塞的诊断价值。结果 CTP检查结果显示,病侧区与健侧对照区的脑灌注值[(20.42±6.30) Hu vs (67.58±25.25) Hu]、PE [(4.38±0.53) Hu vs (7.81±0.50) Hu]、CBV [(2.20±0.34) mL/100 g vs (4.61±1.53) mL/100 g]比较,病侧区明显低于健侧对照区,TTP为(13.43±1.28) s,明显多于健侧对照区的(9.95±1.30) s,差异均有统计学意义(P<0.05);54例急性脑梗死患者应用DSA检查,均发现病灶同侧症状性脑动脉狭窄或闭塞,检出率为100%;应用CVUS检查,发现病灶同侧脑血管狭窄或闭塞者为42例,检出率为77.78%,CTA检查发现病灶同侧脑血管狭窄或闭塞41例,检出率为75.93%,CVUS和CTA的检出率明显低于DSA检出率,差异均有统计学意义(P<0.05);而CVUS+CTP检出者51例,检出率为94.44%,CTA+CTP检出者52例,检出率为96.30%,以上两者联合检查的检出率与DSA的检出率比较差异均无统计学意义(P>0.05)。结论 "CVUS+CT"与"CTA+CTP"检查均能够有效判断出急性脑梗死缺血范围,提高急性脑梗死合并症状性脑血管狭窄或闭塞的检出率,且与DSA相比差异不明显,值得推广使用。展开更多
文摘Objective: To compare and analyze the image quality and radiation dose of three scanning modes of dual-source CT coronary artery retrospectively, and to discuss the application value of TurboFlash coarse pitch scanning mode. Methods: The imaging data of 100 patients who underwent CT coronary angiography (CCTA) using Siemens force CT retrospective gated triggering spiral scan (RES-SPIRAL), adaptive prospective gated triggering sequence scan (SEQ) and prospective coarse pitch scan (TurboFlash) retrospectively was collected. The image quality was evaluated by objective and subjective methods. The effective radiation dose of patients was compared and analyzed, and the indications of the three scanning modes were analyzed. The application value of dual-source CT TurboFlash coarse pitch scanning in coronary artery imaging was evaluated. Results: The results showed that the left main coronary artery, the right coronary artery and their tertiary branches could be clearly displayed in the three groups of images: the left anterior descending branch, the left circumflex branch, and their three-level branches. There was no statistical difference in subjective image quality among the three groups of pictures (P > 0.05). There was no statistical difference in objective evaluation indexes, such as CT value, SNR, CNR and Noise among the three groups (P > 0.05). The patient radiation dose results showed that the effective radiation dose ED of RES-SPIRA scan was (9.22 ± 1.33) mSv. The dose of SEQ was (2.88 ± 2.47) mSv, and the dose of TurboFlash was (0.51 ± 0.16) mSv. There was significant difference in comparison of the three groups (P 0.05). RES-spiral scanning had the highest radiation dose and TurboFlash coarse pitch scanning (TurboFlash) had the lowest radiation dose. Conclusion: TurboFlash coarse pitch scanning is low in dosage, fast in speed and wide in adaptability. It is especially suitable for the elderly, children, coma and other patients who cannot cooperate with breath-holding examination, as well as for the screening and examination of coronary artery diseases in asymptomatic population. Undoubtedly, it is a worthy method of heart coronary artery examination.
文摘Objective: To explore the significance of dual-energy CT non-linear fusion technique in improving the quality of CTA image of renal cancer. Methods: The CTA images of 100 patients who had been confirmed by pathology as renal cancer were collected and were randomly divided into experimental group and control group with 50 cases respectively. The two groups of patients were treated with iodine concentration of 300 mg/ml and 350 mg/ml non-ionic contrast agent, with a dosage of 1.5 ml/kg and an injection rate of 4 ml/s. The contrast agent intelligently tracking method was adopted bolus. The control group used the conventional CTA scanning, with a reference tube voltage/tube current of 100 kv/ref150 mas. The experimental group adopted the double energy scanning, with ball tube A and ball tube B. The reference tube voltage/tube current was 100 kv/ref250 mas and sn150 kv/ref125 mas respectively. The images of the experimental group were non-linear fused to obtain the Mono+ 55 kev single-energy images. The CT value, SNR contrast ratio of the abdominal aorta, renal artery and tumor tissue of the experimental group images and the 100 KV images and the Mono+ 55 kev images of the control group were compared. The objective evaluation and subjective evaluation of the image quality of the three groups of images was performed. Results: The results showed that the 100 kV images of the experimental group were statistically different from those of the control group (P05) in CT value, SNR and CNR (P 0.05). And there was no statistically significant difference between the non-linear fusion single-energy Mono+ 55 kev images and the control group images in CT value, SNR and CNR (P > 0.05). The subjective evaluation of image quality showed that there was no significant difference between Mono+ 55 kev images and control group images, and the quality of Mono+ 55 kev images was higher than that of experimental group 100 kV images. Conclusion: The dual-energy CT non-linear fusion technique can improve the quality of CTA image in patients with renal cancer, and it is possible to obtain high quality CTA images with low iodine concentration contrast agent.
文摘Purpose: To explore the significance of dual-source computed tomography (DECT) virtual monoenergetic reconstructions technology in improving image quality for portal vein system of pancreatic cancer patients. Materials and methods: 47 patients with clinically suspected pancreatic cancer (all confirmed by pathology) were collected. Routine plain scan was performed with Siemens Force dual-source dual-energy CT followed by 3 scans respectively carried out in arterial phase, portal phase and delayed phase. Traditional virtual monoenergetic reconstructions (Mono_E) and new generation of virtual monoenergetic reconstructions (Mono+) were respectively performed on portal vein images to obtain virtual single energy images including Mono_ E70 keV, Mono_E 55 keV and Mono+ 70 keV and Mono+ 55 keV. The signal-to-noise ratio (SNR) and noise of portal vein, normal pancreatic tissues and pancreatic lesions of 100 kV, Mono_E and Mono+ images were compared. In addition, the contrast noise ratio of portal vein and lesions as well as pancreatic tissues and lesions (CNR PV, CNRtumor) were also compared. At the same time, two imaging physicians with rich clinical experiences read the films and scored the images of each group by using the 5-point scoring method. Results: Mono+ 55 keV images including SNRpv, SNRpanc, SNRtumor, Noise, CNRpv, CNRtumor were statistically different from 100 KV images and Mono_E images (P < 0.05). As for the subjective score, Mono+ 55 keV image score also had the highest score, which had statistical significance (P < 0.05). The results showed that Mono+ 55 keV images had the best quality. Conclusion: The new generation of virtual Mono+ post-treatment can reduce image noise. Low energy Mono+ images can improve the contrast between pancreatic cancer lesions and portal of pancreatic cancer patients.
文摘目的:分析多层螺旋CT(multi-slice spiral CT,MSCT)在胰腺浆液性微囊腺瘤(serous microcystic adenoma of the pancreas,SCAP)、胰腺乏血供神经内分泌肿瘤(pancreatichypo-vascularizedneuroendocrinetumors,hypo-PNETs)中的鉴别效果与其影像特点。方法:回顾性分析2021年8月—2022年8月莒县碁山镇卫生院收治的经病理检查证实的78例SCAP与hypo-PNETs患者的临床资料,全部患者均进行MSCT检查,以病理检查结果为“金标准”,统计MSCT检查的诊断符合率;另分析SCAP与hypo-PNETs的影像特点差异。结果:病理检查显示:78例患者中,SCAP共40例,hypo-PNETs共38例。MSCT检查共检出39例SCAP,38例hypoPNETs,总诊断符合率为98.72%(77/78);hypo-PNETs边界不清占比为77.50%(31/40)、无纤维间隔占比为80.00%(32/40)、动脉期强化占比为87.50%(35/40)、无浮云征占比为75.00%(30/38)、有转移或侵犯占比为80.00%(32/40),高于SCAP患者的21.05%(8/38)、26.32%(10/38)、44.74%(17/38)、26.68%(9/38)、0.00%,差异有统计学意义(P<0.05);而两者的部位、形态、胰管扩张、密度、钙化情况相比,差异无统计学意义(P>0.05)。结论:MSCT在SCAP、hypo-PNETs鉴别诊断中效果显著,而SCAP、hypo-PNETs两者的影像学特点存在较大差异,可为临床提供可靠的参考,值得临床大力推广。
文摘目的探究颈部血管彩超(CVUS)及颈部CT血管造影术(CTA)联合CT脑灌注成像(CTP)对急性脑梗死合并脑血管狭窄或闭塞的诊断价值。方法选取2018年1月至2019年4月在韩城市人民医院神经内科治疗的急性脑梗死患者54例作为研究对象,采用数字减影血管造影(DSA)、CVUS、CTA、CTP检查(DSA为检查金标准),重建获取图像,比较病侧区、健侧对照区CTP参数脑灌注值、强化峰值(PE)、达峰时间(TTP)、脑血容量(CBV),并对比分析不同检查方法对脑血管狭窄或闭塞的诊断价值。结果 CTP检查结果显示,病侧区与健侧对照区的脑灌注值[(20.42±6.30) Hu vs (67.58±25.25) Hu]、PE [(4.38±0.53) Hu vs (7.81±0.50) Hu]、CBV [(2.20±0.34) mL/100 g vs (4.61±1.53) mL/100 g]比较,病侧区明显低于健侧对照区,TTP为(13.43±1.28) s,明显多于健侧对照区的(9.95±1.30) s,差异均有统计学意义(P<0.05);54例急性脑梗死患者应用DSA检查,均发现病灶同侧症状性脑动脉狭窄或闭塞,检出率为100%;应用CVUS检查,发现病灶同侧脑血管狭窄或闭塞者为42例,检出率为77.78%,CTA检查发现病灶同侧脑血管狭窄或闭塞41例,检出率为75.93%,CVUS和CTA的检出率明显低于DSA检出率,差异均有统计学意义(P<0.05);而CVUS+CTP检出者51例,检出率为94.44%,CTA+CTP检出者52例,检出率为96.30%,以上两者联合检查的检出率与DSA的检出率比较差异均无统计学意义(P>0.05)。结论 "CVUS+CT"与"CTA+CTP"检查均能够有效判断出急性脑梗死缺血范围,提高急性脑梗死合并症状性脑血管狭窄或闭塞的检出率,且与DSA相比差异不明显,值得推广使用。
