d'unité Hounsfield (UH) faux

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Med 2024-5-13

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评论： Cris LaPierre 2024-6-4

J'ai des images de scanner au format DICOM. Lorsque j'utilise MicroDicom pour les visualiser, je trouve une plage d'unité Hounsfield (UH) entre -1000 et 2000, ce qui est normal. mais lorsque j'utilise la fonction dicomread sur Matlab, je trouve des matrices contenant des valeurs entre 0 et 4000. S'il vous plaît j'ai besoin d'aide

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Answer 1

Cris LaPierre 2024-5-13

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dicomread loads the raw pixel intensity values. You need to use the RescaleSlope and RescaleIntercept metadata properties to convert the intensity values into Hounsfield Units. The equation for this is

A better option is to use the new medicalImage (2D images) and MedicalVolume (3D volumes) functions to load your dicom file (included in the Medical Imaging Toolbox). The resulting object contains the pixel or voxel property values already scaled to Hounsfield Units.

A third option is to use the getPixelData function to load your dicom files. By default, this will rescale the pixel values in the rescale metadata properties are found in the file.

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Med 2024-6-3

svp comment je peux modifier les valeurs de matrice corspond a l'image selon les paramètres windowcentre et windowwidth de matadata

Cris LaPierre 2024-6-4

windowcenter and windowwidth do not modify the matrix values. They set the display range, which affect brightness and contrast. You can do that using imshow(I,[low high])

Typicaly, low would be windowcenter - windowwidth/2 and high would be windowcenter + windowwidith/2

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