Search Results

Now showing 1 - 5 of 5

Some of the metrics are blocked by your
consent settings
Opened-tip applicator and ex vivo experimental results for microwave breast cancer ablation
(2012-11-26)
Sanpanich, A.
;
Kajornpredanon, Y.
;
Phasukkit, P.
;
Tungjitkusolmun, S.
;
Pintavirooj, C.
Breast cancer is one of the main health hazard that threatening women life all over the world. Not only her own daily life, but also her own family whom suffering from this poor fate. Besides from a breast resection, microwave ablation is also another effective therapeutic technique for glandular tissue cancer treatment due to its minimal invasive maneuver. In this paper, we propose a study of an opened-tip applicator ablation for breast cancer therapy. The investigation was preliminary performed by using finite element method to analyze a characteristic of antenna and to simulate a 2.45 GHz electromagnetic wave phenomenon in living tissue then following by ex vivo experiment with female swine breast. In term of FEM simulation, full 3D distribution pattern of SAR, temperature and also estimated destructive tissue area in a complicated CAD model of cancerous breast was analyzed. Real ablation with an ultrasound-guided applicator insertion was implemented to confirm an effective result. This study not only shows a promising result but also encourage us to develop an advance microwave ablation system in near future. © 2012 IEEE.
Some of the metrics are blocked by your
consent settings
Comparision of open slot angle for asymmetry slot antenna using 3D finite element method
(2011-12-01)
Thaiwat, K.
;
Nantivatana, P.
;
Phasukkit, P.
;
Tungjitkusolmun, S.
;
Sangworasil, M.
This paper presents analysis of asymmetry slot antenna configuration for microwave ablation at 2450 MHz using three-dimensional finite element analyses treatment for liver tissue. We designed new coaxial-slot antenna is opened slot at one-side of antenna. We study heat transfer for liver tissue by used MW Ablation system, varying the angle of open slot at 90°, 180°, 270° and 360°. The results illustrate that the coaxial-slot asymmetry structure antenna can be used in microwave ablation for treatment of the liver cancer tissue. Areas of treatment depend on angle of open slot, power and operated time which we can control destruction of the cancer cell in the area closed to the very fragile tissue or blood vessel. © 2011 IEEE.
Some of the metrics are blocked by your
consent settings
Shape matching using set of curve geometric invariant point
(2005-12-01)
Pintavirooj, C.
;
Nantivatana, P.
;
Putjarupong, P.
;
Withayachumnankul, W.
;
Sangworasil, M.
We introduce a non-iterative geometric-based method for shape matching using a novel set of geometric landmarks residing on a 2D contours. These landmarks are intrinsic and are computed from the differential geometry of the curve. We exploit the invariant properties of geometric landmarks that are local and preserved under the affine and some perspective transformation. Geometric invariant exploits coplanar five-point invariant and ration of area constructed from a sequence of consecutive landmarks. These invariants are preserved not only in affine map but weak perspective map as well. To reduce the sensitivity of the landmarks to noise, we use a B-Spline surface representation that smoothes out the curve prior to the computation of the landmarks. The matching is achieved by establishing correspondences between the landmarks after a conformal sorting based on derived absolute invariant and registering the contours. The experiments have shown that the purposed methods are robust and promising even in the presence of noise. Copyright UNION Agency - Science Press.
Some of the metrics are blocked by your
consent settings
Multiresolution image alignment based on discrete wavelet transform
(2005-01-01)
Lohakan, M.
;
Nantivatana, P.
;
Narkbuakaew, W.
;
Pintaviroj, C.
;
Sangworasil, M.
We introduce a multi-resolution image registration based on using discrete wavelet transform. We first extract contour from both images that we want to align. The extracted contours are then fitted with B-spline curve representation to synthesize the new contours with equal number of point. The area parameter is used in the B-spline fitting to make the new generated curve immune to affine transformation. Before representing the B-spline contour with discrete wavelet transform, the problem of starting point of the contour needs to be handle. This can be done by computing the maximum curvature. The maximum curvature is selected as the starting point. Once the starting points on the contour have been established, the discrete wavelet transform is then recursively represented the contours until only a few points are remained. Due to the affine-invariant properties of discrete wavelet transform, these points can be used as landmark points for registering the transformed contour with the original contour. The experiments have shown that the purposed methods are robust and promising even in the presence of noise.
Some of the metrics are blocked by your
consent settings
Non-linear image registration using perspective invariant and thin-plate spine
(2004-12-01)
Putjarupong, P.
;
Pintavirooj, C.
;
Nantivatana, P.
;
Withayachumnankul, W.
;
Sangworasil, M.
We introduce a non-iterative geometric-based method to register an image using a novel set of geometric landmarks residing on an extracted 2D contours from the image. These landmarks are intrinsic and computed from the differential geometry of the curve. We exploit the invariant properties of maximum-curvature points that are local and robust under the affine and some perspective transformation. Geometric invariant exploits five-point coplanar invariant constructed from 5 consecutive landmarks. This invariant is preserved not only in affine map but weak perspective map as well. The alignment is achieved by establishing correspondences between the landmarks after a conformal sorting based on derived absolute invariant and undoing non-linear transformation which is a Thin-Plate Spline (TPS). The experiments have shown that the purposed methods are robust and promising even in the presence of noise. © 2004IEEE.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results