Aims and objectives
The Penumbra-Effect describes blurring at the margins of an image-profile due to the finite size of the energy source.
A computer aided detection (CAD) algorithm based on the De-Convolution Technique can be used to pinpoint true-edge positions to sub-pixel accuracy and remove the Penumbra-Effect via sub-pixel transfers without trade-off losses.
Enhancement is achieved by the removal of the Penumbra-Effect.
Radial Cerebral MIP (Maximum Intensity Projection) images and CT images of a fractured humerus were used for the studies.
We hypothesize that hyper-accurate measurements of very...
Methods and materials
Composite phantom and New-York Catphan-500 images were used for calibration.
30 radial MRA MIP (MR Angiogram Maximum Intensity Projection) images and 63 CT images were analyzed and dimensions of an aneurysm measured.
Phantom calibrations: Measurements: area/volume at 1% low-contrast,
accurate to 1/10th of a pixel.
(1) 30 radial MRA MIP images at 6 degree intervals of an aneurysm of the anterior communicating artery of a 72 year-old male patient were analyzed.
For demonstration purposes,
Slice #14 (at 840) [IMG00013#14] was used.
Figure 1 shows the original image with region of interest (ROI) placed on the aneurysm.
Figure 2 shows images of 'before' and 'after' enhancement at 9x magnification.
Figure 3 shows the measurement of the Indirect...
Such enhanced animations offer alternative representations of the image data and the resulting hyper-accurate measurements may be used for diagnosis,
treatment monitoring and/or surgical planning of small structures such as cerebral aneurysm and fractures.
For further information or inquiries about software.
Kui Ming Chui,
either via website: http://www.iet.org.uk or
via e-mail: email@example.com .
"The removal of the penumbra effect by a CAD based on the
Several field examples were used to
demonstrate the merits of this technique to enhance images for clearer
diagnosis and accurate measurements." by Chui K.M.,
European Congress of Radiology,
"A De-Convolution Technique used for NDT in X-ray & CT",
Oral/Full paper presentation in 17th World Conference on
Non-destructive Testing (17WCNDT),