Intraoperative imaging is vital for accurate placement of instrumentation in spine surgery. However, the use of biplanar fluoroscopy and other intraoperative imaging modalities is associated with the risk of significa...Intraoperative imaging is vital for accurate placement of instrumentation in spine surgery. However, the use of biplanar fluoroscopy and other intraoperative imaging modalities is associated with the risk of significant radiation exposure in the patient, surgeon, and surgical staff. Radiation exposure in the form of ionizing radiation can lead to cellular damage via the induction of DNA lesions and the production of reactive oxygen species. These effects often result in cell death or genomic instability, leading to various radiation-associated pathologies including an increased risk of malignancy. In attempts to reduce radiation-associated health risks, radiation safety has become an important topic in the medical field. All practitioners, regardless of practice setting, can practice radiation safety techniques including shielding and distance to reduce radiation exposure. Additionally, optimization of fluoroscopic settings and techniques can be used as an effective method of radiation dose reduction. New imaging modalities and spinal navigation systems have also been developed in an effort to replace conventional fluoroscopy and reduce radiation doses. These modalities include Isocentric Three-Dimensional C-Arms, O-Arms, and intraoperative magnetic resonance imaging. While this influx of new technology has advanced radiation safety within the field of spine surgery, more work is still required to overcome specific limitations involving increased costs and inadequate training.展开更多
目的探讨并行采集技术在术中磁共振成像(Intraoperative Magnetic Resonance Imaging,iMRI)系统的应用价值。方法基于3.0 T iMRI系统,对20例正常被试进行T1轴位、T2轴位、T2反转恢复序列轴位、T2矢状位四个序列的常规采集和并行采集,计...目的探讨并行采集技术在术中磁共振成像(Intraoperative Magnetic Resonance Imaging,iMRI)系统的应用价值。方法基于3.0 T iMRI系统,对20例正常被试进行T1轴位、T2轴位、T2反转恢复序列轴位、T2矢状位四个序列的常规采集和并行采集,计算并比较常规和并行采集的成像时间、图像的不均匀性指标(Non-Uniformity Index,NUI)和主观评分。结果相较于常规采集,采用并行采集技术的总扫描时长缩短了41.9%。并行采集技术下图像的NUI和主观评分相较于常规采集无显著差异(P>0.05)。结论并行采集技术在iMRI系统的应用有效缩短了扫描时长,且对术中成像质量无影响,可以为提高手术效率、保证患者安全提供技术支持。展开更多
In this paper we propose a new method for evaluating image recording strategies for limited angle tomography. In limited angle tomography exact three-dimensional （3-D） reconstruction is not achievable. With this met...In this paper we propose a new method for evaluating image recording strategies for limited angle tomography. In limited angle tomography exact three-dimensional （3-D） reconstruction is not achievable. With this method a metric for the reachable reconstruction quality by defined X-ray source trajectories is calculated. The result of our method is independent of reconstruction algorithms. Our approach is based on the gradients of the scanned volume and their grade of determinability. Compared to simulated reconstruction accuracy with simultaneous algebraic reconstruction techniques, the method of evaluation shows the same dependencies on X-ray source trajectories. By using the proposed method different source trajectories for a limited angle range are comparable with respect to the reachable reconstruction quality.展开更多
目的探讨双室术中磁共振(Intraoperative Magnetic Resonance Imaging,iMRI)在手术和常规临床扫描联合应用的临床价值。方法收集2019年3月1日至2019年12月31日在双室iMRI设备引导下行术中扫描的患者110例,常规临床扫描患者4154例。计算...目的探讨双室术中磁共振(Intraoperative Magnetic Resonance Imaging,iMRI)在手术和常规临床扫描联合应用的临床价值。方法收集2019年3月1日至2019年12月31日在双室iMRI设备引导下行术中扫描的患者110例,常规临床扫描患者4154例。计算联合扫描方式下iMRI设备的效益与产出,制定手术患者在双室iMRI系统中进行“术前-术中-术后”的多模态扫描方案,分析其优势。结果联合扫描为设备提升了72.9%的收入,且无不良事件发生;双室iMRI系统下的“术前-术中-术后”扫描降低了手术患者候机时长;多模态影像结果显示,60.9%的患者在术中首次成像达到手术要求,再次成像后比例提升至91.8%。结论3.0T双室高场强iMRI在手术和常规临床的联合应用大幅提升了设备使用效率,颅内肿瘤多模态成像方案对指导手术具有重要价值。展开更多
文摘Intraoperative imaging is vital for accurate placement of instrumentation in spine surgery. However, the use of biplanar fluoroscopy and other intraoperative imaging modalities is associated with the risk of significant radiation exposure in the patient, surgeon, and surgical staff. Radiation exposure in the form of ionizing radiation can lead to cellular damage via the induction of DNA lesions and the production of reactive oxygen species. These effects often result in cell death or genomic instability, leading to various radiation-associated pathologies including an increased risk of malignancy. In attempts to reduce radiation-associated health risks, radiation safety has become an important topic in the medical field. All practitioners, regardless of practice setting, can practice radiation safety techniques including shielding and distance to reduce radiation exposure. Additionally, optimization of fluoroscopic settings and techniques can be used as an effective method of radiation dose reduction. New imaging modalities and spinal navigation systems have also been developed in an effort to replace conventional fluoroscopy and reduce radiation doses. These modalities include Isocentric Three-Dimensional C-Arms, O-Arms, and intraoperative magnetic resonance imaging. While this influx of new technology has advanced radiation safety within the field of spine surgery, more work is still required to overcome specific limitations involving increased costs and inadequate training.
文摘目的探讨并行采集技术在术中磁共振成像(Intraoperative Magnetic Resonance Imaging,iMRI)系统的应用价值。方法基于3.0 T iMRI系统,对20例正常被试进行T1轴位、T2轴位、T2反转恢复序列轴位、T2矢状位四个序列的常规采集和并行采集,计算并比较常规和并行采集的成像时间、图像的不均匀性指标(Non-Uniformity Index,NUI)和主观评分。结果相较于常规采集,采用并行采集技术的总扫描时长缩短了41.9%。并行采集技术下图像的NUI和主观评分相较于常规采集无显著差异(P>0.05)。结论并行采集技术在iMRI系统的应用有效缩短了扫描时长,且对术中成像质量无影响,可以为提高手术效率、保证患者安全提供技术支持。
基金Supported by the German Federal Ministry of Education and Research (No.01EZ0839)
文摘In this paper we propose a new method for evaluating image recording strategies for limited angle tomography. In limited angle tomography exact three-dimensional （3-D） reconstruction is not achievable. With this method a metric for the reachable reconstruction quality by defined X-ray source trajectories is calculated. The result of our method is independent of reconstruction algorithms. Our approach is based on the gradients of the scanned volume and their grade of determinability. Compared to simulated reconstruction accuracy with simultaneous algebraic reconstruction techniques, the method of evaluation shows the same dependencies on X-ray source trajectories. By using the proposed method different source trajectories for a limited angle range are comparable with respect to the reachable reconstruction quality.
文摘目的探讨双室术中磁共振(Intraoperative Magnetic Resonance Imaging,iMRI)在手术和常规临床扫描联合应用的临床价值。方法收集2019年3月1日至2019年12月31日在双室iMRI设备引导下行术中扫描的患者110例,常规临床扫描患者4154例。计算联合扫描方式下iMRI设备的效益与产出,制定手术患者在双室iMRI系统中进行“术前-术中-术后”的多模态扫描方案,分析其优势。结果联合扫描为设备提升了72.9%的收入,且无不良事件发生;双室iMRI系统下的“术前-术中-术后”扫描降低了手术患者候机时长;多模态影像结果显示,60.9%的患者在术中首次成像达到手术要求,再次成像后比例提升至91.8%。结论3.0T双室高场强iMRI在手术和常规临床的联合应用大幅提升了设备使用效率,颅内肿瘤多模态成像方案对指导手术具有重要价值。
