KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Search Results

Now showing 1 - 8 of 8

Some of the metrics are blocked by your
consent settings
A study of an intubated tracheal air flow in a cuff-leak testing procedure
(2018-04-23)
Sanpanich, Arthorn
;
Kajornpredanon, Yongyuth
;
Sroykham, Watchara
;
Petsarb, Kuson
;
Phairoh, Chaaim
During an artificial ventilation, an endotracheal tube (ETT) must be inserted into patient airway and following by a balloon cuff blowing in order to function as an artificial airway. However, this implementation adversely affects to a tracheal tissue and all sensitive area and probably damaging a larynx and vocal cord zone. After ETT was removed, some patients always suffering with a larynx or tracheal edema symptom in which patient airway is narrowed due to a long term pressurization by the ETT balloon cuff and causing a difficulty in his spontaneous breathing. In general, a cuff leak test is performed in order to predict a larynx or tracheal edema possibility before ETT extubation from an air volume difference between an inspiration and expiration. In this paper, an investigation of an airflow pattern and air velocity which able to imply as an air volume in the cuff leak test process is proposed in order to understand and support a prediction of the tracheal edema. The study was performed with no edema and edema case at 10, 30 and 50% of trachea internal diameter. The simulations indicate that airflow pattern shows some affects when edema region is higher than 10%. Even though, this preliminary study was intently implemented in a simple intubated trachea model, however the obtain results guide us a practical information and will be used as a basic implementation for a further study, especially in case of variety in the ETT cuff shape and pressure or in cuff less ventilation even more complication case in the near future.
Some of the metrics are blocked by your
consent settings
Contactless palmprint alignment based on intrinsic local affine-invariant feature points
(2014-02-12)
Phromsuthirak, Choopol
;
Tangsuksant, Watcharin
;
Sanpanich, Arthorn
;
Pintavirooj, Chuchart
A Palmprint, biométrie characteristics, was mostly found in civil and commercial applications for security system because it has more reliable and easy to capture by low resolution devices. This paper was to develop a new contactless palmprint alignment with general USB camera on tripod. The palmprint image is acquired by this camera and using intrinsic local affine-invariant key points residing on the area patches spanning between two successive fingers to align palmprint image. The key points are relative affine invariant to affine transformations so this algorithm does not need the guidance pegs in acquisition process to fix hand position to avoid the scaling, translation and rotation problems for correctly palmprint image alignment. Finally, the developed algorithm was tested by 10 left-handed palmprint images collected from different subjects. The simulation results indicate by distance map error of 1.4899 pixels.
Some of the metrics are blocked by your
consent settings
Hand shape identification using palmprint alignment based on intrinsic local affine-invariant fiducial points
(2014-01-20)
Phromsuthirak, Choopol
;
Suwan, Supakorn
;
Sanpanich, Arthorn
;
Pintavirooj, Chuchart
Palmprint is the mostly popular biometrics used in security system. However, it is difficult to acquire the palmprint features with the common problems of pose, lighting, orientation, gesture etc. of palmprint image. So, these problems have the effect to reduce the level of confidence in personal authentication. In this paper, we proposed a new hand shape identification using palmprint alignment without guidance pegs algorithm for improving the level of confidence in palmprint identification system. The palmprint alignment based on a set of fiducial points which are intrinsic, local and preserved under affine transformation. The fiducial points are relative affine invariant to affine transformations, they allow for alignment where position of the palm relative to camera orientation can be arbitrary set. Moreover, before palmprint alignment process, the web camera which was used to capture the palmprint image was calibrated by Camera Calibration Toolbox developed by Jean-Yves Bouguet. The performance of the identification algorithm was tested in 2 types: intra-class identification and inter-class identification. The intra-class identification has the most of distance map error was started from 1.4 pixels to 4.5 pixels and the inter-class identification has 18 percent equal error rate.
Some of the metrics are blocked by your
consent settings
Palmprint alignment using intrinsic local affine-invariant fiducial points residing on area patches spanning between two successive fingers
(2014-01-01)
Phromsuthirak, Choopol
;
Sanpanich, Arthorn
;
Pintavirooj, Chuchart
This paper deals with the problem of palmprint alignment based on intrinsic local affine-invariant fiducial points residing on the area patches spanning between two successive fingers. The palmprint data is acquired by using general USB camera. Because these fiducial points are local and intrinsic, they allow for partial alignment, where only some part of the palmprint is viewed. Moreover, since the fiducial points are relative affine invariant to affine transformations, they allow for alignment where position of the palm relative to camera orientation can be arbitrary set. A fast non-iterative alignment procedure is proposed that establishes reliable correspondences between fiducial points without any prior knowledge of the overall global transformation that took place after the changes in camera orientation. This is achieved through the construction of a set of ordered novel absolute local affine invariants. With enough fiducial points set as correspondents, the overall affine transformation is computed and the palmprint before and after the transformation are aligned. The average alignment error was found to be in the order of 0.5% of the size of the palm corresponding to the physical resolution of 2.6 mm. © 2014 IEEE.
Some of the metrics are blocked by your
consent settings
3D extraction using DLT with one camera
(2013-12-01)
Adhan, Suchin
;
Pintavirooj, Chuchart
;
Sanpanich, Arthorn
This paper proposes a method for accurate measurement of a three-dimensional of an eye's pupil by combining local stereo images which are acquired from multiway. A calibrated mini CCD camera is used to capture the side-by-side image of one eye by two plane mirrors to create a reflection of the two directions of the eye at a time. The center of mass is used for two-dimensional coordinates of the center of the pupil. The new and simple technique to solve the problem of geometric distortion is proposed by taking advantage of the Direct Linear Transformation (DLT), which requires only a single step in the refinement stage without changing or reinstalling a camera. The DLT algorithm was used for the three-dimensional coordinates of the center of the pupils from the previous two-dimensional coordinates for the three-dimensional position of the eyes is detected. The results are the statistical errors only slight, mean = 0.16°, S.D. = 0.15°, which shows that the system is suitable for high-precision medical applications for the movement of the human eye. © 2013 IEEE.
Some of the metrics are blocked by your
consent settings
Effect of phase difference in multi-antenna microwave thermal ablation for breast cancer treatment
(2013-10-31)
Phasukkit, Pattarapong
;
Sanpanich, Arthorn
;
Tungjitkusolmun, Supan
;
Hamamoto, Kazuhiko
It was realized that cancer in breast is one of the most health hazards threatening women around the world for many years. Thermal ablation by using microwave energy is another alternative surgical maneuver due to its minimally invasive therapeutic technique. In this research, we investigate an effect of phase difference between three adjacent openedslot coaxial probes in a multiple antenna alignment of microwave thermal ablation system for breast cancer treatment. FEM by using COMSOL is an implementation tools to simulate for 0, 45, 90, 135 and 180 degree of phase difference. 3D Simulation results show that temperature distribution pattern, destructive volume and SAR in breast tissue are affected from those phase-shift utilization in multi-antenna system significantly. © 2013 IEEE.
Some of the metrics are blocked by your
consent settings
An investigation on attenuation UCT with wave paths enhancement for breast ultrasound
(2012-12-21)
Sanpanich, Arthorn
;
Hamamoto, Kazuhiko
;
Pintavirooj, Chuchart
Breast cancer is one of the most prevalent health hazards in women all over the world. An annual screening test using a diagnostic ultrasound seems to be an appropriate method to handle this physical threat. In this paper, we propose the use of a two-dimensional reflection-mode ultrasonic tomography system for a general breast ultrasound investigation enhanced by an echo wave path using a wave reflecting plate. Our virtual imaging setup system is composed of a 128-element conventional linear array transducer placed on the top of a water bath and a wave reflector attached around this setup. The shape of the wave reflector was designed as a single plate shape, rectangular shape and curve shape. For projection data, we estimate a line integral insonifying data by using a classical integration slope of attenuation coefficient method in which its derivative is independent of transmittance, reflectance, and noise. By imaging a virtual breast phantom model, the reconstruction results obtained from an iterative algebraic reconstruction technique (ART) algorithm show a promising image. The image is not only indicates a tissue characterization from quantitative attenuation data, but also restores an area covered by hard tissue due to an increased wave path direction from our nonrotational imaging system. These results encourage us to implement our concept with a clinical study in the near future. © 2012 Institute of Electrical Engineers of Japan.
Some of the metrics are blocked by your
consent settings
White blood cell segmentation by distance mapping active contour
(2008-12-01)
Sanpanich, Arthorn
;
Iampa, Woranut
;
Pintavirooj, Chuchart
;
Tosranon, Prasong
White blood cell segmentations are an important research issue in Hematology and related study field. Our research proposes a segmentation of nucleus and cytoplasm of peripheral white blood cell from color image slides. The segmentation is started by using a dilated perimeter of nucleus convex hull which propagated into a surrounding region in order to setup a color reference table of cytoplasm. Primary cytoplasm region was then estimated roughly. Distance mapping was applied to this primary area and used to create a gradient vector flow. The active contouring technique was then implemented according to the vector field and finally segmented the WBC boundary. The obtained segmentation outputs show that active contour which guided by the distance mapping from a surrounding area is able to extract nucleus and cytoplasm region efficiently. © 2008 IEEE.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results