contrast-to-noise ratio


Also found in: Acronyms.

contrast-to-noise ratio

An MRI term for the ratio of signal intensity differences between two regions, scaled to image noise. Improving the CNR increases the ability to distinguish between two areas of clinical interest.
Mentioned in ?
References in periodicals archive ?
Assessment of an advanced image-based technique to calculate virtual monoenergetic computed tomographic images from a dual-energy examination to improve contrast-to-noise ratio in examinations using iodinated contrast media.
d) contrast-to-noise ratio (CNR), calculated as the difference between the mean attenuation of the artery and the mean attenuation of the muscle, divided by image noise:
CTA, computed tomography angiography; DS-CTA, dual-source computed tomography angiography; IQR, interquartile range; SNR, signal-to-noise ratio; CNR, contrast-to-noise ratio.
The quantitative analysis consisted of contrast-to-noise ratio.
SNR-A was the contrast-to-noise ratio of the irradiated portion of the phantom and SNR-B was the non-radiated part.
Signal-to-noise ratios (SNRs) and contrast-to-noise ratios (CNRs) were calculated from all steps.
9,10) In a study of 93 patients, Zhang et al (10) showed that focal hepatic lesions had similar CT-density measurements and contrast-to-noise ratios on virtual unenhanced and true unenhanced images.
Image quality of TNC, VNCa, VNCv, and VNCe images, contrast-to-noise ratio (CNR) of metastasis in relation to the liver parenchyma, and metastasis detection rate were evaluated and analyzed.