一种肝脏肿瘤介入治疗计划系统的设计
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一种肝脏肿瘤介入治疗计划系统的设计
An Interventional Treatment Plan
System Design on Liver Tumor
谢小辉 张磊 余小舫 杜如虚
1 Introduction
I
nterventional treatment procedure is more popular
used in hospital than before, since this technique gives
substantially less trauma for the patient. Image-guided
navigation technique is important in interventional
treatment procedure because enhanced medical image can
provide much more guide information than traditional
method.
[1]
Image-guided system also provide intuitive 3D
information by graphic models; thus physicians do not
need envisage a 3D space based on a series of 2D slices.
Such a navigation system can contribute to abdominal
interventions such as radiofrequency ablation (RFA) or
percutaneous ethanol injection therapy (PEIT) for liver
tumor
[2]
.
An interventional navigation system by J.Hong and
H.Nakashima etc. using slicer with MRI and US images
is designed. Their preliminary results of phantom and
animal experiments are achieved. And the results show
that this method can utilize the advantage of both MRI
(Magnetic Resonance Image) and Ultrasound. And the
clinicalfeasibilityispartiallyconrmedthatthesystem
is applied in PEIT (Percutaneous Ethanol Injection
Therapy) of two patients
[2]
. Emad M.Boctor and Gabor
Fichinger etc. have developed a system using slicer with
the passive mechanical arm to do the liver ablation.
The system can be used in ex-vivo on animal models
and eventually human cadaver teats, in order to address
uncertainties in real-time tracking and deformation
[3]
.
Currently, it is found no image navigation system on
liver tumor is applied in the hospital. Doctors carry on
the treatment procedure depending on their experiences
by natural medical image like CT, Ultrasound etc. In
order to assist doctors in work, an image navigation
system is developed by us. Interventional treatment plan
is important in image navigation procedure, so this paper
will give a detailed description about the plan system
design.
2
Theory and Modeling
I
n this section, It is introduced some foundation theory
which will be used in the interventional treatment plan
system, including the displaying technique like window/
level, threshold, and image histogram, the segmentation
technique like region growing segmentation and level
set segmentation, etc, and also rendering technique like
surface rendering and volume rendering
[4]
.
2.1 Displaying DICOM Data Module
MostoftheDICOMleisthetypeofgraylevelimage,
stored in 12 bits or 16 bits. And also the grayscale
value always distributed from -2000 to 2000 with 4000
intensities, but the computer can only display 256 level’
摘 要
由于介入治疗对病人的创伤小,已经越来越流行。通过使用VTK和ITK来实现一个计划系统,治疗能够更加高效。
VTK用来实现可视化,ITK用来实现图像分割和配准。通过使用VTK、ITK,同时使用QT来实现用户界面,我们设计了一个介
入治疗计划系统,此系统实现了如下功能:DICOM数据多层面重组信息的显示,手动分割,半自动分割,使用MC算法的
面重建,以及使用光线投影算法的体重建。最终一个基于医学诊断的介入治疗计划系统也被开发成功。
关键词
介入治疗;可视化;配准;VTK;ITK
ABSTRACT Interventional treatment becomes increasingly popular since this technique means substantially less trauma
for the patient. By using VTK and ITK to build a plan system, the treatment can be high efciency. VTK is responsible
for visualization, while the ITK take care of the image segmentation and registration. By combining VTK and ITK, and
using Qt as the user interface, an interventional treatment plan system is built. This system has nished several mainly
functions, like DICOM data displaying in multi-planar reformation, manual segmentation, semi-automatic segmentation,
surface rendering using marching cubes algorithm, volume rendering using volume ray casting algorithm. In the end an
interventional treatment plan system has been developed based on the medical inspection.
KEYWORDS Interventional treatment; Visualization; Segmentation; VTK; ITK