Method and apparatus for acquiring CT perfusion images
US6373920B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 16, 2001 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Mar 16, 2021 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/032
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Methods and apparatus for generating a difference image to determine perfusion parameters, such as mean transit time, cerebral blood flow, and cerebral blood volume utilizing a CT imaging system are described. To generate difference images, a difference projection data set including a first sub-set and a second sub-set of projection data is acquired. The first sub-set is obtained when no contrast medium is present in a patient or shortly after the contrast medium is injected into the patient. The second sub-set is obtained after the contrast medium is absorbed by the patient. The difference projection data is generated by subtracting the first sub-set from the second sub-set. The difference projection data then undergoes image reconstruction processing to generate the difference images. The difference images are then mapped to an image generated using the first sub-set, and perfusion parameters are determined utilizing the mapped difference image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.