The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The process of single section 2D/3D registration one by one based on the whole bone registration is presented. After linear interpolation, the original 3D CT data had the same resolution in all three direction and the CT volume data is segmented by manual. After calibration x-ray film scene, the digitally reconstructed radiographs(DRRs) are got using "Ray Tracing" algorithm and interpolation...
Partial volume correction (PVC) can compensate for cross-talk between different anatomical regions in images from a functional imaging system with poor spatial resolution, such as PET or SPECT, by utilizing data from a high-resolution structural imaging modality, such as CT or MRI. We have developed a new PVC method for SPECT, and here we present an evaluation of this method using clinical data from...
We introduce the use of a novel physical phantom to quantify the performance of a motion-correction algorithm. The goal of the study was to assess a PET-PET image registration, the final output of which is a motion-corrected high-statistics PET image volume, a procedure called Reconstruct, Register and Average (RRA). Methods: A phantom was constructed using 5~2mL Ge-68 filled spheres suspended in...
Philips has introduced the world's first whole body sequential PET/MR system. We present the current status of MR-based attenuation correction (MRAC) technique. MRAC consists of MR image acquisition, segmentation, truncation compensation (TC), μ-value assignment, as well as correction for patient table and RF coils. These components have been described last year; this paper focuses on updates of the...
Registration between 3-D volumes and 2-D fluoro images for Electrophysiology (EP) is a challenging task due to the lack of corresponding features between 2-D and 3-D data. This paper presents an automatic, accurate and workflow-friendly 2-D/3-D registration method specially designed for patient movement correction during EP procedures. Firstly, 2-D spines are enhanced by exploiting the temporal information...
In this paper, we report our current progress results on computer assisted diagnostic (CAD) system, which consists of three units: database unit (statistical atlas of human anatomy), image processing unit (image enhancement, image segmentation, image registration), and visualization unit (volume rendering). In the database unit, we proposed a new method called generalized N-dimensional principal component...
Cone-beam CT (CBCT) scanners are based on volumetric tomography, using a 2D extended digital array providing an area detector. Compared to traditional CT, CBCT has many advantages, such as less X-ray beam limitation, high image accuracy, rapid scan time, etc. However, In CBCT images there are always some ring artifacts that appear as rings centered on the rotation axis. Due to the data of the constructed...
Respiratory motion during PET acquisition from the chest/abdomen leads to significant image degradation. Combined PET/MR scanners open up the opportunity to correct motion using MR data acquired simultaneously with PET. As simultaneous human chest/abdomen PET/MR images are currently unobtainable, in this preliminary study we determined motion parameters from respiratory-gated MR and then used these...
Computed tomography (CT) is used for the attenuation correction of positron emission tomography (PET) to enhance the efficiency of data acquisition process and to improve the quality of the reconstructed PET data in the brain. Due to the use of two different modalities, chances of misalignment between PET and CT images are quite significant. The main cause of this misregistration is the motion of...
Cone-beam CT (CBCT) scanners are based on volumetric tomography, using a 2D extended digital array providing an area detector [1]. Compared to traditional CT, CBCT has many advantages, such as less X-ray beam limitation, high image accuracy, rapid scan time, etc. However, in CBCT images there are always some ring artifacts that appear as rings centered on the rotation axis. Due to the data of the...
Cardiac Resynchronization Therapy is a treatment for bi-ventricular asynchronism. It can be optimized by the identification of the most effective pacing sites. The aim of this study is to provide a helpful tool to perform this identification by the fusion of electrical and anatomical information resulting from Electro-Anatomic Mapping (EAM) data and Multislice Computerized Tomography (MSCT) imaging...
Medical image registration methods based on the maximization of mutual information have shown promising results. But it needs much computing time. This paper presents a new method to rigid registration based on the combination of scale images and mutual information. Firstly, the concept of area morphology is introduced. And then, the scale images are constructed with the area morphological operators...
[Objective] To get three-dimensional (3-D) surface visualization results of the liver and tumors by Amira(MERCURY,USA) for liver hyperthermia treatment planning. [Methods] Liver CT slices obtained from Chinese PLA General Hospital were loaded into Amira, and then image preprocessing(image registration, cropping, segmentation) was accomplished by Amira. At last 3-D visualization results were acquired...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.