CN111227835B - 一种膝关节动态成像装置及其使用方法 - Google Patents
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Abstract
本发明公开一种膝关节动态成像装置及其使用方法,包括循环加载组件、磁共振扫描仪、数据终端;循环加载组件包括气缸、病床,气缸传动连接推杆,推杆连接足套,病床顶面设有大腿绑带、小腿绑带、固定夹具,推杆与足套之间设有压力传感器,气缸与足套之间设有位移传感器;数据终端信号连接压力传感器、位移传感器、气缸、磁共振扫描仪,数据终端包括I/O装置、电子时钟、处理中心、计数器。本发明能够对载荷状态下的关节进行成像操作,有效降低其他相位对图像的影响,结构简单,成本较低。
Description
技术领域
本发明涉及医疗成像装置领域,尤其涉及一种膝关节动态成像装置及其使用方法。
背景技术
在骨关节的临床诊断中,有一项非常重要的检查内容,即在负荷状态下对关节形态和关节内结构进行检测,以分析骨关节病变发展状况和病理状态。众所周知,人体大关节负荷和非负荷状态下关节半月板、韧带形态均存在差异,非负荷状态下关节影像学检查和体检无法显示人在行走或直立状态下的关节内结构变化情况和相对位置改变。因此在骨科学和影像学检查中,负重位X线关节摄片成为常用的检查手段,也是骨关节炎等疾病的标准成像技术之一。
现有的MRI成像装置均是对无负载状态下的关节进行扫描成像,而当人体关节在载荷状态下,会发生变形,如何消除相位对图像的影响也是尚待解决的问题。
发明内容
本发明旨在提供一种膝关节动态成像装置及其使用方法,能够对载荷状态下的关节进行成像操作,有效降低其他相位对图像的影响,结构简单,成本较低。
为达到上述目的,本发明是采用以下技术方案实现的:
本发明公开一种膝关节动态成像装置,包括循环加载组件、磁共振扫描仪、数据终端;
循环加载组件包括气缸、病床,气缸传动连接推杆,推杆连接足套,病床顶面设有大腿绑带、小腿绑带、固定夹具,推杆与足套之间设有压力传感器,气缸与足套之间设有位移传感器;
数据终端信号连接压力传感器、位移传感器、气缸、磁共振扫描仪,数据终端包括I/O装置、电子时钟、处理中心、计数器。
优选的,病床顶面为强摩擦结构。
优选的,足套为硬质塑料。
优选的,位移传感器为激光位移传感器。
优选的,固定夹具为硬质塑料,在对需要扫描的人体或尸体进行3D扫描成像后,采用高强度塑料进行3D打印定制,卡在大腿上段或股骨近端处。
优选的,位移传感器设于气缸外壁。
本发明还公开上述成像装置的使用方法,其包括以下步骤:
S100、使用大腿绑带固定人体大腿,使用小腿绑带固定人体小腿,使用固定夹具固定人体股骨,患者穿戴足套;
S200、驱动气缸对膝关节进行循环加载,载荷大小为F,单词载荷循环时间为T,循环次数为C,磁共振扫描仪选择位于膝关节内侧间室且股骨及胫骨侧软骨充分接触的矢状面进行,
其中磁共振扫描仪为采用3.0T磁共振扫描仪以及带有位移编码影像处理的磁共振测试序列,在序列中
优选的,步骤S200中,F为50%或100%患者的体重,T为5s或10s,C为50次、100次或200次。
优选的,步骤S200中,位移编码MRI的编码梯度在平面上的2个方向均为0.33π/mm,并设定600ms的TM缓冲时间以确保MRI图像在载荷平台期获取。
优选的,步骤S200中,Single-shot fast spin echo序列TE时间为62/72/82ms,TR时间为5000ms,扫描FOV为180×180mm,矩阵大小为256×256/384×384/512×512pixels,层厚1mm,激励次数为16次。
本发明的有益效果:
1、本发明能够对载荷状态下的关节进行成像操作。
2、本发明有效降低其他相位对图像的影响。
3、本发明结构简单,成本较低。
附图说明
图1为气缸的示意图;
图2为本发明的示意图。
图中:1-气缸、2-推杆、3-压力传感器、4-足套、5-病床、6-大腿绑带、7-小腿绑带、8-固定夹具。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合附图,对本发明进行进一步详细说明。
图2中A部位即为MRI成像窗口。
如图1、图2所示,本发明包括循环加载组件、磁共振扫描仪、数据终端;
循环加载组件包括气缸1、病床5,气缸1传动连接推杆2,推杆2连接足套4,病床5顶面设有大腿绑带6、小腿绑带7、固定夹具8,推杆2与足套4之间设有压力传感器3,气缸1与足套4之间设有位移传感器,足套4和气缸1、推杆2均为硬质塑料;
数据终端信号连接压力传感器3、位移传感器、气缸1、磁共振扫描仪,数据终端包括I/O装置、电子时钟、处理中心、计数器。
位移传感器为二维激光位移传感器,用于测量足套4在加载方向上的位移量。
上述装置的使用方法,其包括以下步骤:
S100、将膝关节平放在测试台上,足部由同加载装置固定连接的硬塑料足套4固定,膝关节保持伸直位,用木制夹具固定股骨以避免膝关节负载时身体在加载方向上的运动,使用大腿绑带6固定人体大腿,使用小腿绑带7固定人体小腿,在加载装置末端安装二维激光位移传感器以检测足套4在加载方向上的位移量;
S200、驱动气缸1对膝关节进行循环加载,载荷大小为F,单词载荷循环时间为T,循环次数为C,磁共振扫描仪选择位于膝关节内侧间室且股骨及胫骨侧软骨充分接触的矢状面进行,
其中磁共振扫描仪为采用3.0T磁共振扫描仪以及带有位移编码影像处理的磁共振测试序列,采用电子触发装置同步MRI成像和膝关节循环加载装置,在序列中
步骤S200中,F为50%或100%患者的体重,T为5s或10s,C为50次、100次或200次。
步骤S200中,位移编码MRI的编码梯度在平面上的2个方向均为0.33π/mm,并设定600ms的TM缓冲时间以确保MRI图像在载荷平台期获取。
步骤S200中,Single-shot fast spin echo序列TE时间为62/72/82ms,TR时间为5000ms,扫描FOV为180×180mm,矩阵大小为256×256/384×384/512×512pixels,层厚1mm,激励次数为16次。
当然,本发明还可有其它多种实施例,在不背离本发明精神及其实质的情况下,熟悉本领域的技术人员可根据本发明作出各种相应的改变和变形,但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。
Claims (9)
1.一种膝关节动态成像装置,其特征在于:包括循环加载组件、磁共振扫描仪、数据终端;
循环加载组件包括气缸、病床,气缸传动连接推杆,推杆连接足套,病床顶面设有大腿绑带、小腿绑带、固定夹具,推杆与足套之间设有压力传感器,气缸与足套之间设有位移传感器;
数据终端信号连接压力传感器、位移传感器、气缸、磁共振扫描仪,数据终端包括I/O装置、电子时钟、处理中心、计数器;
所述成像装置的使用方法包括以下步骤:
S100、使用大腿绑带固定人体大腿,使用小腿绑带固定人体小腿,使用固定夹具固定人体股骨,患者穿戴足套;
S200、驱动气缸对膝关节进行循环加载,载荷大小为F,单次载荷循环时间为T,循环次数为C,磁共振扫描仪选择位于膝关节内侧间室且股骨及胫骨侧软骨充分接触的矢状面进行,
其中磁共振扫描仪为采用3.0T磁共振扫描仪以及带有位移编码影像处理的磁共振测试序列:
2.根据权利要求1所述的成像装置,其特征在于:病床顶面为强摩擦结构。
3.根据权利要求1所述的成像装置,其特征在于:足套为硬质塑料。
4.根据权利要求1所述的成像装置,其特征在于:位移传感器为激光位移传感器。
5.根据权利要求1所述的成像装置,其特征在于:固定夹具为硬质塑料。
6.根据权利要求1所述的成像装置,其特征在于:位移传感器设于气缸外壁。
7.根据权利要求1所述的成像装置,其特征在于:步骤S200中,F为50%或100%患者的体重,T为5s或10s,C为50次、100次或200次。
8.根据权利要求1所述的成像装置,其特征在于:步骤S200中,位移编码MRI的编码梯度在平面上的2个方向均为0.33π/mm,并设定600ms的TM缓冲时间以确保MRI图像在载荷平台期获取。
9.根据权利要求1所述的成像装置,其特征在于:步骤S200中,Single-shot fast spinecho序列TE时间为62/72/82ms,TR时间为5000ms,扫描FOV为180×180mm,矩阵大小为256×256/384×384/512×512pixels,层厚1mm,激励次数为16次。
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