AI Article Synopsis
- The study aimed to enhance the contrast-to-noise ratio of noncontrast head CT images, which are important for diagnosing acute ischemic strokes, by using a combination of volume helical scanning and a 3D denoising filter.
- Scans were conducted on phantoms and patients using a 16-row multidetector CT unit, and results showed that the 3D denoising filter significantly improved the image quality and was comparable to nonhelical images.
- The findings concluded that the volume helical scanning technique with the 3D denoising filter effectively improves the overall quality of noncontrast head CT images, while specific artifacts were managed better compared to traditional nonhelical scans.
Article Abstract
Purpose: The aim of this study was to improve the contrast-to-noise ratio on noncontrast head computed tomography (CT) images, which are crucial for assessing patients with acute ischemic stroke. We applied a technique combining volume helical scanning with a three-dimensional (3D) denoising filter.
Materials And Methods: We scanned phantoms for low-contrast resolutions and helical/cone-beam artifacts as well as stroke patients using a 16-row multidetector-row CT (MDCT) unit. Volume helical scans with 1-mm collimation and nonhelical scans with 8-mm thickness were performed. From the 1-mm thick volume data, 8-mm thick contiguous images were generated before and after applying a 3D denoising filter.
Results: On images stacked from volume data, the contrast-to-noise ratio was significantly improved by the 3D denoising filter and was nearly the same as that on nonhelical images. On stacked volume images, artifacts due to the cone beam and the helical scan were increased with larger helical pitches, but bone-related streak artifacts in the posterior fossa and underneath the calvarium were reduced when compared with nonhelical images.
Conclusion: Volume helical scan with a 3D denoising filter effectively improves image quality in noncontrast head MDCT images.
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| http://dx.doi.org/10.1007/s11604-007-0145-3 | DOI Listing |
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