Due Tonight!

CT

X-Ray

Computed tomography

CT

CAT

Image Volumes

Axial

Sagittal

Coronal

Voxel size for CT: 0.625-1.25 mm^3

similar to MRI

0

255

Hounsfield Units

Different Tissues, Different Intensities

measure of the reduction intensity of a ray of light by the tissue through it passes

Hounsfield Units

Window/Level

optimized for soft tissue

Window/Level

optimized for lung

Window/Level

optimized for bones

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Contrast agent can help highlight certain features

injection or oral

ROI appears brighter

Risk for cancer from CT: 1 out of 2000

higher risk of allergy against contrast agent

COVID-19 CT Scans

37 yrs

52 yrs

73 yrs

ground-glass opacity (GGO)

Dental Artifact

Contrast Artifact

Portable CT

The AMIGO Suite

Tina Kapur, PhD

Executive Director of Image Guided Therapy

Assignment 5

PyDicom

load CT volume, slice it, adjust window/level

Coming soon!

CS480 Lecture 27

By Daniel Haehn

CS480 Lecture 27

Slides for CS80 Biomedical Signal and Image Processing at UMass Boston. See https://cs480.org!

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