Podcast
Questions and Answers
What is the primary purpose of a CT scan?
What is the primary purpose of a CT scan?
What is the function of the detector array in a CT scanner?
What is the function of the detector array in a CT scanner?
How many profiles are acquired within one rotation of the scanner?
How many profiles are acquired within one rotation of the scanner?
What is the purpose of the patient couch (table) in a CT scanner?
What is the purpose of the patient couch (table) in a CT scanner?
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What is the result of one complete rotation of the scanner?
What is the result of one complete rotation of the scanner?
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What is digital geometry processing used for in a CT scanner?
What is digital geometry processing used for in a CT scanner?
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Study Notes
Purpose of CT Scans
- CT scans provide detailed cross-sectional images of internal structures such as internal organs, blood vessels, bones, and soft tissue
- CT scans are used for diagnostic purposes, guidance for treatment or further tests, surgeries, biopsies, and radiation therapy
- CT scans are used to detect and monitor conditions such as cancer, heart disease, lung nodules, and liver masses
CT Scan Technique
- Digital geometry processing is used to generate a 3D image of the inside of the body from a large series of 2D X-ray images taken around a single axis of rotation
- The CT scanner has a circular opening with a flat "patient couch (table)" that can be adjusted upwards, downwards, frontwards, or backwards to position the patient for imaging
- The patient lies flat on the table, which moves into the gantry while the X-ray tube rotates around the patient
- The scanner gantry contains the rotating portion that holds the X-ray tube generator and the detector array
- As X-rays pass through the patient, they are detected and a computer system acquires and performs the necessary calculations to create a viewable image
- One cross-sectional slice of the body is obtained for each complete rotation
- Multiple shots are taken as the scanner rotates, resulting in around 1,000 "profiles" per rotation
- A 2D image (slice) is formed when a full set of profiles from each rotation are analyzed by a computer and compiled
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Description
Learn about the purpose of CT scans, including diagnostic purposes, guidance for treatment, and detection of conditions. Also, understand the digital geometry processing technique used to generate 3D images.
