Choroidal osteoma (CO) is a rare, ossifying benign tumor originated in the choroid that typically occurs in otherwise healthy young women (1,2). It is characterized by a yellowish, well demarcated lesion in the juxtap...Choroidal osteoma (CO) is a rare, ossifying benign tumor originated in the choroid that typically occurs in otherwise healthy young women (1,2). It is characterized by a yellowish, well demarcated lesion in the juxtapapillary or macular area. The diagnosis is clinical and can be confirmed with the use of fluorescein or indocyanine angiography, optical coherence tomography, computed tomography or magnetic resonance imaging. Choroidal neovascularization or subretinal fluid, the main causes for vision loss, can be treated with laser therapy, photodynamic therapy or intravitreal antivascular endothelial growth factor therapy. We present a case of choroidal osteoma, showing the role of the high resolution 3D spiral computed tomography.展开更多
Objective To prospectively investigate the diagnostic accuracy for coronary artery stenosis of prospectively electrocardiogram-triggered spiral acquisition mode (high pitch mode) dual-source computed tomography corona...Objective To prospectively investigate the diagnostic accuracy for coronary artery stenosis of prospectively electrocardiogram-triggered spiral acquisition mode (high pitch mode) dual-source computed tomography coronary angiography (CTCA) in patients with relatively higher heart rates (HR) compared with catheter coronary angiography (CCA). Methods Forty-seven consecutive patients with relatively higher HR (>65 and <100 bpm) (20 male, 27 female; age 55±10 years) who both underwent dual-source CTCA and CCA were prospectively included in this study. All patients were performed CTCA using high pitch mode setting at 20%-30% of the R-R interval for the image acquisition. All coronary segments were evaluated by two blinded and independent observers with regard to image quality on a three-point scale (1: excellent to 3: non-diagnostic) and for the presence of significant coronary stenoses (defined as diameter narrowing exceeding 50%). Considered CCA as the standard of reference, the sensitivity, specificity, positive predictive value and negative predictive value were calculated. Radiation dose values were calculated using the dose-length product. Results Image quality was rated as being score 1 in 92.4% of segments, score 2 in 6.1% of segmentsand score 3 in 1.5% of segments. The average image quality score per segment was 1.064±0.306. The HR variability of patients with image score 1, 2 and 3 were 2.29±1.06 bpm, 5.17±1.37 bpm, 8.88±1.53 bpm, respectively. The average HR variability of patients with different image scores were significantly different (F=170.402, P=0.001). The sensitivity, specificity, positive and negative predictive values were 92.6%, 97.0%, 87.6%, 98.3%, respectively, per segment and 90.0%, 95.2%, 85.3%, 96.9%, respectively, per vessel and 100%, 63.6%, 90.0%, 100%, respectively, per patient. The effective radiation dose was on average 0.86±0.16 mSv. Conclusion In patients with HR more than 65 bpm and below 100 bpm without cardiac arrhythmia, the prospectively electrocardiogram-gated high-pitch spiral acquisition mode with image acquired timing set at 20%-30% of the R-R interval provides a high diagnostic accuracy for the assessment of coronary stenoses combined with a 1.5% of non-diagnostic coronary segments and a radiation dose below 1 mSv.展开更多
目的:评价160排螺旋模式肺动脉成像(CTPA)的优势及临床应用价值。方法:70例临床怀疑肺动脉栓塞的受检者,行CTPA检查,按随机表分为2组,A组35例采用160排螺旋模式肺动脉成像;B组35例采用传统64排螺旋模式肺动脉成像。由2名有经验的放射科...目的:评价160排螺旋模式肺动脉成像(CTPA)的优势及临床应用价值。方法:70例临床怀疑肺动脉栓塞的受检者,行CTPA检查,按随机表分为2组,A组35例采用160排螺旋模式肺动脉成像;B组35例采用传统64排螺旋模式肺动脉成像。由2名有经验的放射科医师在同一工作站上阅读2组CTPA横断面图像,测量、记录参数包括主肺动脉CT值(CT value of pulmonary artery,PACTv)、主肺动脉CT值标准差(SD)、左心房CT值(CT value of left atrium,LACTv)、主肺动脉CT值与左心房CT值差值(PACTv-LACTv)、延迟时间(delay time,DT)、扫描时间(scan time,ST)、剂量长度乘积(dose length prod-uct,DLP)、有效辐射剂量(effective dose,ED)及对比噪声比(contrast to noise ratio,CRN),并进行统计学分析。结果:2组病例主肺动脉CTv(F=1.499,P=0.079)、主肺动脉SD(F=4.935,P=0.344)差异无统计学意义。而2组病例的左心房CT值(F=1.278,P=0.031)、主肺动脉CT值与左心房CT值差值(F=0.872,P=0.011)、延迟时间(F=1.829,P=0.001)、扫描时间(F=2.373,P=0.000)、对比噪声比(F=2.219,P=0.019)、剂量长度乘积(F=0.032,P=0.000)、有效辐射剂量(F=0.056,P=0.001)及对比剂剂量(F=1.705,P=0.000)差异均有统计学意义。结论:160排螺旋扫描模式CTPA成像的对比噪声比低于传统64排螺旋扫描模式,但160排螺旋扫描模式的扫描时间短,对比剂剂量、有效辐射剂量低,对于急、重症肺动脉栓塞患者临床应用价值更高。展开更多
文摘Choroidal osteoma (CO) is a rare, ossifying benign tumor originated in the choroid that typically occurs in otherwise healthy young women (1,2). It is characterized by a yellowish, well demarcated lesion in the juxtapapillary or macular area. The diagnosis is clinical and can be confirmed with the use of fluorescein or indocyanine angiography, optical coherence tomography, computed tomography or magnetic resonance imaging. Choroidal neovascularization or subretinal fluid, the main causes for vision loss, can be treated with laser therapy, photodynamic therapy or intravitreal antivascular endothelial growth factor therapy. We present a case of choroidal osteoma, showing the role of the high resolution 3D spiral computed tomography.
基金Supported by the Ministry of Science and Technology of Inner Mongolia, China (20110504)
文摘Objective To prospectively investigate the diagnostic accuracy for coronary artery stenosis of prospectively electrocardiogram-triggered spiral acquisition mode (high pitch mode) dual-source computed tomography coronary angiography (CTCA) in patients with relatively higher heart rates (HR) compared with catheter coronary angiography (CCA). Methods Forty-seven consecutive patients with relatively higher HR (>65 and <100 bpm) (20 male, 27 female; age 55±10 years) who both underwent dual-source CTCA and CCA were prospectively included in this study. All patients were performed CTCA using high pitch mode setting at 20%-30% of the R-R interval for the image acquisition. All coronary segments were evaluated by two blinded and independent observers with regard to image quality on a three-point scale (1: excellent to 3: non-diagnostic) and for the presence of significant coronary stenoses (defined as diameter narrowing exceeding 50%). Considered CCA as the standard of reference, the sensitivity, specificity, positive predictive value and negative predictive value were calculated. Radiation dose values were calculated using the dose-length product. Results Image quality was rated as being score 1 in 92.4% of segments, score 2 in 6.1% of segmentsand score 3 in 1.5% of segments. The average image quality score per segment was 1.064±0.306. The HR variability of patients with image score 1, 2 and 3 were 2.29±1.06 bpm, 5.17±1.37 bpm, 8.88±1.53 bpm, respectively. The average HR variability of patients with different image scores were significantly different (F=170.402, P=0.001). The sensitivity, specificity, positive and negative predictive values were 92.6%, 97.0%, 87.6%, 98.3%, respectively, per segment and 90.0%, 95.2%, 85.3%, 96.9%, respectively, per vessel and 100%, 63.6%, 90.0%, 100%, respectively, per patient. The effective radiation dose was on average 0.86±0.16 mSv. Conclusion In patients with HR more than 65 bpm and below 100 bpm without cardiac arrhythmia, the prospectively electrocardiogram-gated high-pitch spiral acquisition mode with image acquired timing set at 20%-30% of the R-R interval provides a high diagnostic accuracy for the assessment of coronary stenoses combined with a 1.5% of non-diagnostic coronary segments and a radiation dose below 1 mSv.
文摘目的:评价160排螺旋模式肺动脉成像(CTPA)的优势及临床应用价值。方法:70例临床怀疑肺动脉栓塞的受检者,行CTPA检查,按随机表分为2组,A组35例采用160排螺旋模式肺动脉成像;B组35例采用传统64排螺旋模式肺动脉成像。由2名有经验的放射科医师在同一工作站上阅读2组CTPA横断面图像,测量、记录参数包括主肺动脉CT值(CT value of pulmonary artery,PACTv)、主肺动脉CT值标准差(SD)、左心房CT值(CT value of left atrium,LACTv)、主肺动脉CT值与左心房CT值差值(PACTv-LACTv)、延迟时间(delay time,DT)、扫描时间(scan time,ST)、剂量长度乘积(dose length prod-uct,DLP)、有效辐射剂量(effective dose,ED)及对比噪声比(contrast to noise ratio,CRN),并进行统计学分析。结果:2组病例主肺动脉CTv(F=1.499,P=0.079)、主肺动脉SD(F=4.935,P=0.344)差异无统计学意义。而2组病例的左心房CT值(F=1.278,P=0.031)、主肺动脉CT值与左心房CT值差值(F=0.872,P=0.011)、延迟时间(F=1.829,P=0.001)、扫描时间(F=2.373,P=0.000)、对比噪声比(F=2.219,P=0.019)、剂量长度乘积(F=0.032,P=0.000)、有效辐射剂量(F=0.056,P=0.001)及对比剂剂量(F=1.705,P=0.000)差异均有统计学意义。结论:160排螺旋扫描模式CTPA成像的对比噪声比低于传统64排螺旋扫描模式,但160排螺旋扫描模式的扫描时间短,对比剂剂量、有效辐射剂量低,对于急、重症肺动脉栓塞患者临床应用价值更高。
