| Summary: | 碩士 === 國立成功大學 === 醫學工程學系 === 81 === In this study, an automated system which can compute the
volume ratio of brain parenchyma and cerebral spinal
fluid is built for use in clinics as a diagnosis reference.
From the results of the phantoms measurements, the average
error is about 2.7% for 5 mm scans and 4.3% for 10 mm in a
skull filled with 100 cc water ball experiment. However,
there's no significant difference between 10 mm and 5 mm
scans in the 10 patients measure- ments. Based upon this
consequence, it is suggested that the patient may be scanned
just by 10 mm interval for saving time and reducing radiation
dosage. Some image segmentation methods are also discussed in
this thesis, such as pyramid , Laplacian-of-Gaussian
operator, and a newly proposed image segmentation scheme, which
is so called "Supervised image segmentation scheme." For an
image of the size 320x320 , it takes about 10-20 seconds for
processing on a DEC 5000/200 workstation with this scheme.
After segmentation, the volume measurements of CSF and 3D-
display of the brain ventricle are both satisfactorily
presented.
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