目的:通过与多田公式方法做比较,评估Picture Archiving and Communication Systems(PACS)系统三维测量方法测量脑出血体积的准确性。方法:这项回顾性研究纳入了165例急性脑出血患者,并采用36个体积不同、形态不同的不规则水模。均行常...目的:通过与多田公式方法做比较,评估Picture Archiving and Communication Systems(PACS)系统三维测量方法测量脑出血体积的准确性。方法:这项回顾性研究纳入了165例急性脑出血患者,并采用36个体积不同、形态不同的不规则水模。均行常规CT扫描。两名影像医师分别使用两种方法独立测量水模及血肿体积,比较两种方法的差异性及准确性。差异性:按PACS三维测量体积将血肿大小分为5级(0～10.0mL、10.1～20.0mL、20.1～30.0mL、30.1～50.0mL、>50.1mL);按barras scale规则来将血肿形态分为5级,分别根据血肿大小和形状对两种方法测量结果进行分析比较。准确性:用两种方法测得水模体积与水模实际体积作比较;准确性验证:用两种测量方法测得的15例经微创手术病人的出血量与术后证实的实际出血量作对比。结果:当10.0mL<血肿体积≤30.0mL时,两种方法测得结果差异均无统计学意义(P>0.05);当血肿体积≤10.0mL或>30.0mL时,两种方法测量结果差异均有统计学意义(P<0.05);当血肿形态为1～3级时,两种方法测得血肿体积差异均无统计学意义(P>0.05);当血肿形态为4～5级时,两种方法测得血肿体积差异均有统计学意义(P<0.05)。PACS三维方法测得水模体积与实际体积差异无统计学意义(P=0.22),多田公式测量方法测得水模体积与实际体积差异有统计学意义(P=0.01);且PACS三维方法测得体积更接近实际水模体积及15例经微创手术证实的患者真实出血体积。结论:血肿体积过小(≤10mL)或过大(>30mL)时,两种方法测量差异较大;血肿形态越不规则,两种方法测量差异越大;PACS三维测量方法测量体积更接近真实体积。展开更多
As precise positioning of ankle radiography is not possible, quantitative measurement of all syndesmotic parameters on repeated ankle X-ray films may be of little value. The purpose of this study was to provide a set ...As precise positioning of ankle radiography is not possible, quantitative measurement of all syndesmotic parameters on repeated ankle X-ray films may be of little value. The purpose of this study was to provide a set of scientific and objective evaluation criteria for assessing the quality of ankle fracture reduction accurately and reliably by an intelligent combining three-dimensional （3-D） computed tomography （CT） measurement model. Methods From June 2008 to March 2011, all the thin-slice CT images of 100 cases （50 males and 50 females） with normal ankle joint scanned by 16-slice spiral CT were collected. Two-dimensional （2-D） and 3-D images of ankle joints were generated by using multiple planar reconstruction （MPR） and surface shaded display （SSD） respectively. The relevant parameters about bone structures and their relationship were measured and analyzed based on 3-D topological narrow division technique and 3-D measurement techniques combining essential elements of point, line and surface. Results In this study, the mean distance from lateral malleolus tip to talocrural articular surface, the tip of medial malleolus anterior colliculus to talocrural articular surface and lateral malleolus tip to the tip of medial malleolus anterior colliculus were （22.83±1.12） mm, （12.84±1.09） mm, and （61.18±2.03） mm respectively in male group, and （20.16±1.00） mm, （10.30±1.05） mm and （53.00±1.40） mm respectively in female group. The above three parameters were correlated with gender, height and weight （P 〈0.05）. However, the mean perpendicular distance from lateral malleolus tip to the plane through the tip of medial malleolus anterior colliculus, the talocrural angle, later clear space, medial clear space, and the superior clear space were （9.93±0.29） mm, （10.01±0.38）°, （1.94±0.16） mm, （2.78±0.19） mm, and （3.14±0.15） mm respectively in 100 cases, were not significance correlated with gender, height and weight （P 〉0.05）. Conclusions展开更多
To evaluate the feasibility and accuracy of a three-dimensional augmented reality system incorporating integral videography for imaging oral and maxillofacial regions, based on preoperative computed tomography data. T...To evaluate the feasibility and accuracy of a three-dimensional augmented reality system incorporating integral videography for imaging oral and maxillofacial regions, based on preoperative computed tomography data. Three-dimensional surface models of the jawbones, based on the computed tomography data, were used to create the integral videography images of a subject＇s maxillofacial area. The three-dimensional augmented reality system （integral videography display, computed tomography, a position tracker and a computer） was used to generate a three-dimensional overlay that was projected on the surgical site via a half-silvered mirror. Thereafter, a feasibility study was performed on a volunteer. The accuracy of this system was verified on a solid model while simulating bone resection. Positional registration was attained by identifying and tracking the patient/surgical instrument＇s position. Thus, integral videography images of jawbones, teeth and the surgical tool were superimposed in the correct position. Stereoscopic images viewed from various angles were accurately displayed. Change in the viewing angle did not negatively affect the surgeon＇s ability to simultaneously observe the three-dimensional images and the patient, without special glasses. The difference in three-dimensional position of each measuring point on the solid model and augmented reality navigation was almost negligible （〈1 mm）; this indicates that the system was highly accurate. This augmented reality system was highly accurate and effective for surgical navigation and for overlaying a three-dimensional computed tomography image on a patient＇s surgical area, enabling the surgeon to understand the positional relationship between the preoperative image and the actual surgical site, with the naked eye.展开更多
文摘目的:通过与多田公式方法做比较,评估Picture Archiving and Communication Systems(PACS)系统三维测量方法测量脑出血体积的准确性。方法:这项回顾性研究纳入了165例急性脑出血患者,并采用36个体积不同、形态不同的不规则水模。均行常规CT扫描。两名影像医师分别使用两种方法独立测量水模及血肿体积,比较两种方法的差异性及准确性。差异性:按PACS三维测量体积将血肿大小分为5级(0～10.0mL、10.1～20.0mL、20.1～30.0mL、30.1～50.0mL、>50.1mL);按barras scale规则来将血肿形态分为5级,分别根据血肿大小和形状对两种方法测量结果进行分析比较。准确性:用两种方法测得水模体积与水模实际体积作比较;准确性验证:用两种测量方法测得的15例经微创手术病人的出血量与术后证实的实际出血量作对比。结果:当10.0mL<血肿体积≤30.0mL时,两种方法测得结果差异均无统计学意义(P>0.05);当血肿体积≤10.0mL或>30.0mL时,两种方法测量结果差异均有统计学意义(P<0.05);当血肿形态为1～3级时,两种方法测得血肿体积差异均无统计学意义(P>0.05);当血肿形态为4～5级时,两种方法测得血肿体积差异均有统计学意义(P<0.05)。PACS三维方法测得水模体积与实际体积差异无统计学意义(P=0.22),多田公式测量方法测得水模体积与实际体积差异有统计学意义(P=0.01);且PACS三维方法测得体积更接近实际水模体积及15例经微创手术证实的患者真实出血体积。结论:血肿体积过小(≤10mL)或过大(>30mL)时,两种方法测量差异较大;血肿形态越不规则,两种方法测量差异越大;PACS三维测量方法测量体积更接近真实体积。
基金the National Natural Science Foundation of China
文摘As precise positioning of ankle radiography is not possible, quantitative measurement of all syndesmotic parameters on repeated ankle X-ray films may be of little value. The purpose of this study was to provide a set of scientific and objective evaluation criteria for assessing the quality of ankle fracture reduction accurately and reliably by an intelligent combining three-dimensional （3-D） computed tomography （CT） measurement model. Methods From June 2008 to March 2011, all the thin-slice CT images of 100 cases （50 males and 50 females） with normal ankle joint scanned by 16-slice spiral CT were collected. Two-dimensional （2-D） and 3-D images of ankle joints were generated by using multiple planar reconstruction （MPR） and surface shaded display （SSD） respectively. The relevant parameters about bone structures and their relationship were measured and analyzed based on 3-D topological narrow division technique and 3-D measurement techniques combining essential elements of point, line and surface. Results In this study, the mean distance from lateral malleolus tip to talocrural articular surface, the tip of medial malleolus anterior colliculus to talocrural articular surface and lateral malleolus tip to the tip of medial malleolus anterior colliculus were （22.83±1.12） mm, （12.84±1.09） mm, and （61.18±2.03） mm respectively in male group, and （20.16±1.00） mm, （10.30±1.05） mm and （53.00±1.40） mm respectively in female group. The above three parameters were correlated with gender, height and weight （P 〈0.05）. However, the mean perpendicular distance from lateral malleolus tip to the plane through the tip of medial malleolus anterior colliculus, the talocrural angle, later clear space, medial clear space, and the superior clear space were （9.93±0.29） mm, （10.01±0.38）°, （1.94±0.16） mm, （2.78±0.19） mm, and （3.14±0.15） mm respectively in 100 cases, were not significance correlated with gender, height and weight （P 〉0.05）. Conclusions
基金supported by a Grant-in-Aid for Scientific Research (22659366) from the Japan Society for the Promotion of Science
文摘To evaluate the feasibility and accuracy of a three-dimensional augmented reality system incorporating integral videography for imaging oral and maxillofacial regions, based on preoperative computed tomography data. Three-dimensional surface models of the jawbones, based on the computed tomography data, were used to create the integral videography images of a subject＇s maxillofacial area. The three-dimensional augmented reality system （integral videography display, computed tomography, a position tracker and a computer） was used to generate a three-dimensional overlay that was projected on the surgical site via a half-silvered mirror. Thereafter, a feasibility study was performed on a volunteer. The accuracy of this system was verified on a solid model while simulating bone resection. Positional registration was attained by identifying and tracking the patient/surgical instrument＇s position. Thus, integral videography images of jawbones, teeth and the surgical tool were superimposed in the correct position. Stereoscopic images viewed from various angles were accurately displayed. Change in the viewing angle did not negatively affect the surgeon＇s ability to simultaneously observe the three-dimensional images and the patient, without special glasses. The difference in three-dimensional position of each measuring point on the solid model and augmented reality navigation was almost negligible （〈1 mm）; this indicates that the system was highly accurate. This augmented reality system was highly accurate and effective for surgical navigation and for overlaying a three-dimensional computed tomography image on a patient＇s surgical area, enabling the surgeon to understand the positional relationship between the preoperative image and the actual surgical site, with the naked eye.
