Abstract:
The purpose of this study is to determine the output dose and to interprete the
image recordings on nasopharynx tissue using CT-Scan, analyze the output dose
for finding the magnitude of the effective dose and determine abnormal tissue
volume nasopharynx by active contour segmentation method. This research is
divided into three stage, the first is a survey of hospital. The second is a survey of
requirements in retrieving the resulting image data medical patients. This study
uses image data on a radiodiagnostic device CT Scan. This collection is carried
out at the Radiology and Radiodiagnostic Installation Semen Padang Hospital,
Kecamatan Pauh, Padang City, West Sumatra. Third stage is a medical image data
processing using the PHP programming language at Computational Biophysics
Laboratory. Result of This CT scan is in the form of an image that can identify the
location of the tumor or cancer, size, depth and volume. The results require the
effective dose by viewing the dose report from scanning using numerical methods.
To start programming, this requires data input in the form of an image from the
CT scan of the suspected patient experiencing abnormalities in the nasopharynx
which will be evaluated gradually using the active contour method. The output
dose can be viewed on the computer radiologist monitoring. The output dose data
are in the form of CTDIvol, DLP, scan type, size neck phantom. The output dose
data value for each patient is different, this is caused by different disease
variables. The largest volume is found in EL patients who is 51 years old by 390
pixels. The smallest volume is found in AR patients who is 58 year old by 160
Pixels. The value of the effective dose for each patient depends on the type and
position of abnormal parts of the nasopharynx. This factor is caused by different
CTDIvol and DLP dose values and their empirical weight factor values at the neck
part is determined by 0,0059 mSv. mGy−1.cm−1, for each age patient over 15
years old.
