CN105520744A - 鼻咽癌放射治疗定位的ct/mri图像融合辅助装置 - Google Patents
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Abstract
本发明公开了一种鼻咽癌放射治疗定位的CT/MRI图像融合辅助装置及其使用方法,其特征在于:包括头枕本体、n型架杆和三枚标记物,其中,头枕本体用于垫脖子的部位形状为两端高,中间低的马鞍形,头枕本体用于垫头部的部位形状为下凹的圆弧形,头枕本体的底部设有一个凹槽;n型架杆设在头枕本体上方,n型定位架的平直段与水平面保持平行,n型架杆的两个竖直段的下端折弯插入凹槽内与头枕本体连接;n型架杆的平直段和两个竖直段各设有一个定位孔,每个定位孔内设有一枚标记物。本发明可以使鼻咽癌患者的磁共振扫描体位与在CT定位时的体位保持一致,以利于进行CT和MRI图像融合,为临床医师提供了良好的肿瘤靶区识别度。
Description
技术领域
本发明涉及一种医疗用品及使用方法,尤其是一种鼻咽癌放射治疗定位的CT/MRI图像融合辅助装置及其使用方法。
背景技术
计算机扫描CT(computerizedtomography,CT),具有较好的空间分辩率,可以清晰显示解剖结构和病变,经计划系统重建得出的靶器官及重要器官的定位均有较高的精度,经计划设计好的射野,通过激光定位系统将射野形状的外轮廓和射野中心轴等投射到患者皮肤上并做好相关的标记。目前鼻咽癌的三维适形放疗中主要应用CT技术进行影像采集,由于多层螺旋CT采集影像数据时间短,受呼吸运动的影响小,减少了影像变形,提高了影像空间分辨率,且CT值与组织密度值呈线性对应关系可直接应用CT值大小进行放疗计划计算,所以临床放疗计划设计大多以CT影像来确定肿瘤临床靶区。
MRI(magneticresonanceimaging,MRI)具有多参数成像、高对比度成像、任意方位成像、能够对人体能量代谢进行研究(不同的序列如T1、T2、增强脂肪抑制序列)、无电离辐射,安全无创、无骨伪影干扰。MRI提供了良好的软组织分辨率,可以看见肿瘤侵及周围软组织的范围。另外,MRI除了提供在冠状面、矢状面的扫描图像外,还可以显示增强脂肪抑制等序列的成像,可以在三维空间上更好地描述肿瘤的容积。恶性肿瘤的早期,对血管的侵犯以及肿瘤的分期方面优于CT。总的来说,MRI的图象质量显著优于CT。
放疗专业的发展依赖影像学的发展而发展。将CT和MR图像融合起来使用,既可以利用CT图像的良好空间分辨率进行放射治疗剂量计算,又可以利用MRI图像提供的良好组织分辨率进行照射靶区的识别。图像融合的前提是体位的一致与否影响图像配准精度。图像配准是指对于一幅医学图像寻求一种或一系列空间变换,使它与另一幅医学图像上的对应点达到空间上的一致。这种一致是指人体上的同一解剖点在两幅匹配图像上有相同的空间位置。要得到在空间上的一致就必须做到体位的一致。而目前尚没有很好配合鼻咽癌放射治疗定位CT/MRI图像的辅助用具或办法。
发明内容
本发明的目的是提供一种鼻咽癌放射治疗定位的CT/MRI图像融合辅助装置及其使用方法。它可以使鼻咽癌患者的磁共振扫描体位与在CT定位时的体位保持一致,以利于进行CT和MRI图像融合,为临床医师提供良好的肿瘤靶区识别度。
为达上述目的,本发明的具体技术方案为:
一种鼻咽癌放射治疗定位的CT/MRI图像融合辅助装置及其使用方法,其特征在于:包括头枕本体、n型架杆和三枚标记物,其中,头枕本体用于垫脖子的部位形状为两端高,中间低的马鞍形,头枕本体用于垫头部的部位形状为下凹的圆弧形,头枕本体的底部设有一个凹槽;n型架杆设在头枕本体上方,n型定位架的平直段与水平面保持平行,n型架杆的两个竖直段的下端插入凹槽内与头枕本体连接;n型架杆的平直段和两个竖直段各设有一个定位孔,每个定位孔内设有一枚标记物。
所述的n型架杆为半柔性架杆,n型架杆的平直段长度为300mm,宽度为15mm,厚度为10mm,n型架杆的竖直段宽度为15mm,厚度为10mm。
所述的标记物为塑料中空胶囊,内容物为造影剂,规格为直径3mm,长5mm的圆柱形。
所述的凹槽宽度为15mm,深度为10mm。
本发明的有益效果是:
它可以使鼻咽癌患者的磁共振扫描体位与在CT定位时的体位保持一致,以利于进行CT和MRI图像融合,为临床医师提供了良好的肿瘤靶区识别度。
附图说明
图1是本发明的结构示意图;
图2为本发明的主视图;
图3为本发明的左视图;
图4为本发明的右视图;
图5为本发明中的头枕本体的仰视图;
图6为本发明中的n型架杆的结构示意图;
图7为本发明中的标记物的结构示意图。
在图中,头枕本体1,n型架杆2,标记物3,定位孔4,凹槽5。
具体实施方式
下面结合附图和具体实施方式对本发明做进一步说明。
参见图1至图7,本发明由头枕本体1、n型架杆2和三枚标记物3组成。其中,头枕本体1用于垫脖子的部位形状为两端高,中间低的马鞍形,头枕本体1用于垫头部的部位形状为下凹的圆弧形,头枕本体1的底部设有一个凹槽5;头枕本体1采用PU树脂软胶为材料,在硅胶模具中浇注成型。头枕本体1放置在MRI线圈中,可以使得患者在磁共振扫描体位与在CT定位时的体位保持一致。
n型架杆2设在头枕本体1上方,n型定位架2的平直段与水平面保持平行,n型架杆2的两个竖直段的下端折弯插入凹槽5内与头枕本体1连接;n型架杆2的平直段与头枕本体1之间的距离可依据患者的头型大小进行调整。n型架杆2主要用于确定磁共振扫描时患者头部横断面断层图像中与扫描床垂直的层面。
n型架杆2的平直段和两个竖直段各设有一个定位孔4,每个定位孔4内设有一枚标记物3。
所述的n型架杆2为半柔性架杆,n型架杆2的平直段长度为300mm,宽度为15mm,厚度为10mm,n型架杆2的竖直段宽度为15mm,厚度为10mm。
所述的标记物3为塑料中空胶囊,内容物为造影剂,规格为直径3mm,长5mm的圆柱形。
所述的凹槽5宽度为15mm,深度为10mm。
在磁共振扫描中合理使用本装置,可以使鼻咽癌患者的磁共振扫描体位与在CT定位时的体位保持一致,以利于进行CT和MRI图像融合。基于本发明的使用方法,包括以下步骤。
(1)磁共振扫描摆位:在磁共振线圈上放置好本发明的头枕本体1,患者平躺在检查床上,打开激光灯,调整患者体位使得左右两侧眦孔线对准左右激光线,再在头枕中插入n型架杆2,并使得该架杆的内表面尽量贴近患者的皮肤,再用皮肤记号笔通过n型架杆2上的三个定位孔4在患者的皮肤上点上标记点,最后在定位孔4中分别插入标记物3。磁共振扫描摆位完成,叮嘱患者不能移动身体,完成磁共振扫描,磁共振重建层厚为3mm。
(2)患者定位摆位:患者平躺在模拟定位机的治疗床上,采用治疗用头枕,依治疗体位,双眼外眦和外耳孔连线(眦孔线)垂直治疗床,双手置于体侧。
(3)患者治疗定位制膜:按照预摆位的方法摆好患者并且敷好热塑体膜,待体膜冷却后,依据激光灯在患者原体表标记位置,在体膜上划好十字标记。
(4)CT扫描:在CT扫描床上按照定位制膜方式固定好患者,并在体膜上的十字标记处贴上铅珠,完成CT扫描。CT扫描层厚为3mm。
(5)CT/MRI图像融合:向图像融合系统中分别导入该患者的MRI和CT图像,选定CT断层图像中带铅珠的层面和MRI断层图像中带标记物的层面,作为基础参考图像层面进行自动配准融合。至此,定位CT图像与检查所采集的磁共振图像融合过程完毕。
以上所述实施例仅仅是对本发明的优选实施方式进行描述,并非对本发明的范围进行限定,在不脱离本发明设计精神的前提下,本领域技术人员对本发明的技术方案作出的各种变形和改进,均应落入本发明的权利要求书确定的保护范围内。
Claims (4)
1.一种鼻咽癌放射治疗定位的CT/MRI图像融合辅助装置,其特征在于:包括头枕本体(1)、n型架杆(2)和三枚标记物(3),其中,头枕本体(1)用于垫脖子的部位形状为两端高,中间低的马鞍形,头枕本体(1)用于垫头部的部位形状为下凹的圆弧形,头枕本体(1)的底部设有一个凹槽(5);n型架杆(2)设在头枕本体(1)上方,n型定位架(2)的平直段与水平面保持平行,n型架杆(2)的两个竖直段的下端折弯插入凹槽(5)内与头枕本体(1)连接;n型架杆(2)的平直段和两个竖直段各设有一个定位孔(4),每个定位孔(4)内设有一枚标记物(3)。
2.根据权利要求1所述的鼻咽癌放射治疗定位的CT/MRI图像融合辅助装置,其特征在于:所述的n型架杆(2)为半柔性架杆,n型架杆(2)的平直段长度为300mm,宽度为15mm,厚度为10mm,n型架杆(2)的竖直段宽度为15mm,厚度为10mm。
3.根据权利要求1所述的鼻咽癌放射治疗定位的CT/MRI图像融合辅助装置,其特征在于:所述的标记物(3)为塑料中空胶囊,内容物为造影剂,规格为直径3mm,长5mm的圆柱形。
4.根据权利要求1所述的鼻咽癌放射治疗定位的CT/MRI图像融合辅助装置,其特征在于:所述的凹槽(5)宽度为15mm,深度为10mm。
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CN106504257A (zh) * | 2016-11-08 | 2017-03-15 | 中国科学院合肥物质科学研究院 | 一种放疗头部位置姿态测量装置和解算方法 |
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