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发射和透射
相关语句
  emission and transmission
    The establishment of the method of three dimension volumetric fusion of emission and transmission images for PET imaging
    PET发射和透射扫描三维图像融合显示技术的建立
短句来源
    Objective To establish the method of three dimension volumetric fusion of emission and transmission images for PET imaging.
    目的 建立可在PC机上运行的PET显像发射和透射扫描三维图像融合显示技术。
短句来源
    Results The three dimension volumetric fusion of emission and transmission images clearly displayed the silhouette and anatomic configuration in chest, including chest wall, lung, heart, mediastinum, et al.
    结果PET发射和透射扫描三维立体融合图像可清晰显示胸部体表轮廓、双肺野、胸壁、纵隔、心脏等解剖结构 ,可在PC机上运行。
短句来源
  “发射和透射”译为未确定词的双语例句
    Evaluation of emission-transmission registration in FDG PET images for localization of chest lesions
    ~(18)F-FDG PET发射和透射扫描图像融合对胸部病变的定位价值
短句来源
    Forty-eight lesions in chest in 13 cases were accurately located by the image fusion.
    13例患者位于胸壁、胸膜、肺组织、纵隔的 4 8个病灶在PET胸部发射和透射扫描三维融合图像上均正确定位 ,与CT、MRI、全身骨显像等定位结果一致。
短句来源
    CT raw data were reconstructed into three dimensional volume data.
    将PET发射和透射扫描三维容积数据和螺旋CT断层图像数据传入PC机。
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  emission and transmission
Residual discrepancies are attributed to incomplete scatter compensation between emission and transmission.
      
By using a double masking technique simultaneous emission and transmission scans become feasible.
      
Evaluation of SPET quantification of simultaneous emission and transmission imaging of the brain using a multidetector SPET syst
      
Simultaneous emission and transmission measurements as an adjunct to dynamic planar gamma camera studies
      
The result is a dynamic sequence of emission and transmission measurements obtained from a single acquisition.
      
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A wrong diagnosis will occur in cardiac SPECT imaging if the attenuation and scattering of photons by body's soft tissues are not considered. To correct the attenuation, the simultaneous emission and transmission projections are obtained from the same SPECT system, and attenuation correction algorithms must be used in the emission image reconstruction. This paper compares the quality of various image reconstruction algorithms in SPECT, such as conventional filtered back projection, weighted back projection,...

A wrong diagnosis will occur in cardiac SPECT imaging if the attenuation and scattering of photons by body's soft tissues are not considered. To correct the attenuation, the simultaneous emission and transmission projections are obtained from the same SPECT system, and attenuation correction algorithms must be used in the emission image reconstruction. This paper compares the quality of various image reconstruction algorithms in SPECT, such as conventional filtered back projection, weighted back projection, iterative Chang's method, ML EM, OS EM, RAMLA, ML EM with Gibbs smoothing, Bayesian reconstruction, etc.. A mathematical phantom is used to test the varias algorithms. The results suggest some consideration to choose the most appropriate algorithm. A new algorithm, the Multi object Optimization Method is proposed to improve image reconstruction and attenuation correction.

为克服单光子发射计算机断层显像中 ,会出现假阳性的结果。利用胸部数学模型和投影算法得到发射和透射的投影数据 ,采用校正算法重建发射断层图像 ,再与模型数据相比较 ,从而确定各算法的收敛性和收敛速度 ,总结出选择合适的衰减校正算法 ,并提出了将多目标优化方法应用于衰减校正的设想。

Objective To evaluate emission transmission registration for localization of chest lesions Methods PET and CT studies were acquired from 21 patients The pleural surfaces in both emission and transmission image sets were determined by surperficial contour match method The algorithm used for image registration was the surface fitting algorithm The anterior posterior diameter(a p) and left right diameter(l r) through the center of foci were measured in corresponding CT and PET transverse images Results...

Objective To evaluate emission transmission registration for localization of chest lesions Methods PET and CT studies were acquired from 21 patients The pleural surfaces in both emission and transmission image sets were determined by surperficial contour match method The algorithm used for image registration was the surface fitting algorithm The anterior posterior diameter(a p) and left right diameter(l r) through the center of foci were measured in corresponding CT and PET transverse images Results 61 lesions were detected in both PET and CT images All lesions were accurately localized in lung,mediastinum and chest wall,except one mediastinum lesion near thoracic vertebral column The differences between a p and l r value in PET and CT images were (2 7±0 8) mm,(2 4±0 9) mm,and (2 9±0 5) mm, (2 1±0 4) mm respectively ConclusionEmission transmission registration provided extra anatomical information to chest PET image,and can accuratelylocalized the chest lesions

目的 探讨18F 脱氧葡萄糖 (FDG)PET发射和透射扫描图像融合对胸部病变的定位价值。方法 对 2 1例胸部肿瘤患者进行18F FDGPET肿瘤显像 ,图像重建后获得透射扫描和衰减校正后发射扫描各断面断层图像。计算机自动生成发射和透射扫描各断面断层图像双肺胸膜轮廓 ,采用表面轮廓匹配法进行图像融合。结果 在PET胸部透射扫描断层图像上可分辨出主动脉弓、气管、肺门大血管、心脏、肺组织、纵隔、胸壁等解剖结构。 2 1例患者在PET和CT图像上均检出的病灶共6 1个 ,与CT图像病灶位置对比 ,除后纵隔近脊柱旁 1个病灶在融合图像上难以定位外 ,余病灶均能正确定位。CT和融合图像相应横断面图像上病变中心点离胸壁前、后径和左、右径距离的平均差值分别为 (2 7± 0 8)、(2 4± 0 9)、(2 9± 0 5 )和 (2 1± 0 4)mm。结论 PET胸部发射和透射扫描图像融合对胸部病变可作出正确定位。PET透射扫描不仅可用于衰减校正 ,还可用于图像融合 ,提供胸部解剖结构信息。

Objective To establish the method of three dimension volumetric fusion of emission and transmission images for PET imaging. Methods The volume data of emission and transmission images acquired with Siemens ECAT HR + PET scanner were transfered to PC computer by local area network. The PET volume data were converted into 8 bit byte type, and scaled to the range of 0~255. The data coordinates of emission and transmission images were normalized by three-dimensional coordinate conversion in the same way. The images...

Objective To establish the method of three dimension volumetric fusion of emission and transmission images for PET imaging. Methods The volume data of emission and transmission images acquired with Siemens ECAT HR + PET scanner were transfered to PC computer by local area network. The PET volume data were converted into 8 bit byte type, and scaled to the range of 0~255. The data coordinates of emission and transmission images were normalized by three-dimensional coordinate conversion in the same way. The images were fused with the mode of alpha-blending. The accuracy of image fusion was confirmed by its clinical application in 13 cases. Results The three dimension volumetric fusion of emission and transmission images clearly displayed the silhouette and anatomic configuration in chest, including chest wall, lung, heart, mediastinum, et al. Forty-eight lesions in chest in 13 cases were accurately located by the image fusion. Conclusions The volume data of emission and transmission images acquired with Siemens ECAT HR + PET scanner have the same data coordinate. The three dimension fusion software can conveniently used for the three dimension volumetric fusion of emission and transmission images, and also can correctly locate the lesions in chest.

目的 建立可在PC机上运行的PET显像发射和透射扫描三维图像融合显示技术。方法 将SiemensECATHR+ 型PET仪1 8F 脱氧葡萄糖 (FDG)PET全身显像发射扫描和透射扫描原始三维图像容积数据 ,经数据转换、图像转换、三维几何和观察变换、图像融合等实现PET发射和透射扫描三维图像融合 ,图像融合采用Alpha通道方式。通过临床应用验证融合图像的定位准确性。结果PET发射和透射扫描三维立体融合图像可清晰显示胸部体表轮廓、双肺野、胸壁、纵隔、心脏等解剖结构 ,可在PC机上运行。 13例患者位于胸壁、胸膜、肺组织、纵隔的 4 8个病灶在PET胸部发射和透射扫描三维融合图像上均正确定位 ,与CT、MRI、全身骨显像等定位结果一致。结论 SiemensECATHR+ 型PET仪发射和透射扫描图像三维容积数据坐标轴一致 ,胸部发射和透射扫描三维图像融合对胸壁、纵隔等部位病灶与肺内病灶的鉴别诊断有一定价值。

 
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