@@ -638,8 +638,8 @@ class CAT12SANLMDenoisingInputSpec(SPMCommandInputSpec):
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default_value = 0.5 ,
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usedefault = True ,
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field = "addnoise" ,
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- desc = """Strength of additional noise in noise-free regions.
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- Add minimal amount of noise in regions without any noise to avoid image segmentation problems.
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+ desc = """Strength of additional noise in noise-free regions.
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+ Add minimal amount of noise in regions without any noise to avoid image segmentation problems.
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This parameter defines the strength of additional noise as percentage of the average signal intensity.""" ,
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)
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@@ -648,10 +648,10 @@ class CAT12SANLMDenoisingInputSpec(SPMCommandInputSpec):
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field = "rician" ,
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usedefault = True ,
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desc = """Rician noise
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- MRIs can have Gaussian or Rician distributed noise with uniform or nonuniform variance across the image.
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- If SNR is high enough (>3) noise can be well approximated by Gaussian noise in the foreground. However, for
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- SENSE reconstruction or DTI data a Rician distribution is expected. Please note that the Rician noise estimation
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- is sensitive for large signals in the neighbourhood and can lead to artefacts, e.g. cortex can be affected by
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+ MRIs can have Gaussian or Rician distributed noise with uniform or nonuniform variance across the image.
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+ If SNR is high enough (>3) noise can be well approximated by Gaussian noise in the foreground. However, for
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+ SENSE reconstruction or DTI data a Rician distribution is expected. Please note that the Rician noise estimation
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+ is sensitive for large signals in the neighbourhood and can lead to artefacts, e.g. cortex can be affected by
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very high values in the scalp or in blood vessels.""" ,
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)
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@@ -669,11 +669,11 @@ class CAT12SANLMDenoisingInputSpec(SPMCommandInputSpec):
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field = "nlmfilter.optimized.NCstr" ,
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usedefault = True ,
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desc = """Strength of Noise Corrections
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- Strength of the (sub-resolution) spatial adaptive non local means (SANLM) noise correction. Please note
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- that the filter strength is automatically estimated. Change this parameter only for specific conditions. The
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- "light" option applies half of the filter strength of the adaptive "medium" cases, whereas the "strong"
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+ Strength of the (sub-resolution) spatial adaptive non local means (SANLM) noise correction. Please note
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+ that the filter strength is automatically estimated. Change this parameter only for specific conditions. The
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+ "light" option applies half of the filter strength of the adaptive "medium" cases, whereas the "strong"
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option uses the full filter strength, force sub-resolution filtering and applies an additional iteration.
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- Sub-resolution filtering is only used in case of high image resolution below 0.8 mm or in case of the
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+ Sub-resolution filtering is only used in case of high image resolution below 0.8 mm or in case of the
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"strong" option. light = 2, medium = -Inf, strong = 4""" ,
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)
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