Novel noise reduction filter for improving visibility of early computed tomography signs of hyperacute stroke: evaluation of the filter's performance--preliminary clinical experience

The aim of this study was to evaluate the performance of a novel noise reduction filter for improving the visibility of early computed tomography (CT) signs of hyperacute stroke on nonenhanced CT images. Fourteen patients with a middle cerebral artery occlusion within 4.5 h after onset were evaluate...

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Bibliographic Details
Published in:Japanese journal of radiology 2007-06, Vol.25 (5), p.247-254
Main Authors: Takahashi, Noriyuki, Lee, Yongbum, Tsai, Du-Yih, Ishii, Kiyoshi
Format: Article
Language:English
Subjects:
Aged
Aged, 80 and over
Cerebral blood flow
Computed tomography
Electricity - adverse effects
Female
Humans
Infarction, Middle Cerebral Artery - diagnostic imaging
Interfaces
Ischemia
Male
Medical imaging
Middle Aged
Noise control
Noise reduction
Occlusion
Performance evaluation
Radiographic Image Interpretation, Computer-Assisted
Signal processing
Signal to noise ratio
Stroke
Stroke - diagnostic imaging
Substantia alba
Tomography, X-Ray Computed - instrumentation
Tomography, X-Ray Computed - methods
Tomography, X-Ray Computed - standards
Visibility
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Summary:The aim of this study was to evaluate the performance of a novel noise reduction filter for improving the visibility of early computed tomography (CT) signs of hyperacute stroke on nonenhanced CT images. Fourteen patients with a middle cerebral artery occlusion within 4.5 h after onset were evaluated. The signal-to-noise ratio (SNR) of the processed images with the noise reduction filter and that of original images were measured. Two neuroradiologists visually rated all the processed and original images on the visibility of normal and abnormal gray-white matter interfaces. The SNR value of the processed images was approximately eight times as high as that of the original images, and a 87% reduction of noise was achieved using this technique. For the visual assessment, the results showed that the visibility of normal gray-white matter interface and that of the loss of the gray-white matter interface were significantly improved using the proposed method (P < 0.05). The noise reduction filter proposed in the present study has the potential to improve the visibility of early CT signs of hyperacute stroke on nonenhanced CT images.
ISSN:0288-2043
1867-1071
1862-5274
1867-108X
DOI:10.1007/s11604-007-0129-3