Apparatus and method for calibrating detectors in a computed tom

Details Apparatus and method for calibrating detectors in a computed tom Apparatus and method for calibrating detectors in a computed tom

1998-11-02

2000-11-14

Hajec, Donald

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378207, G01D 1800, A61B 600

Patent

active

061480576

ABSTRACT:
A method and apparatus for calibrating detectors in a computed tomography (CT) system to compensate for differential errors in the detectors are disclosed. Multiple sets of scan data are acquired for a phantom at multiple thicknesses of the phantom. The phantom can be made from multiple slabs of material positioned on the scanner table in a horizontal orientation or in a vertical orientation. Horizontal slabs are removed or added to the stack of slabs to vary the thickness of the phantom. With vertically oriented slabs, each slab is of a different height such that scans of different slabs produce X-ray data for rays having different path lengths and, therefore, attenuations. For each detector, errors in the scan data at the multiple phantom thicknesses are identified and fit to a parametric equation with respect to the log attenuation associated with each thickness. In one embodiment, the parametric equation is a quadratic polynomial. The polynomial is used during subsequent scanning of actual objects to adjust attenuation measurements.

REFERENCES:
patent: 4225789 (1980-09-01), Albrecht
patent: 4352020 (1982-09-01), Horiba et al.
patent: 4497061 (1985-01-01), Houndsfield
patent: 4873707 (1989-10-01), Roberson
patent: 5095431 (1992-03-01), Feldman et al.
patent: 5214578 (1993-05-01), Cornuejols et al.
patent: 5335260 (1994-08-01), Arnold
patent: 5539799 (1996-07-01), Schulze-Ganzlin et al.
patent: 5774519 (1998-06-01), Lindstrom et al.

Affiliated with

Also associated with

Rating

Apparatus and method for calibrating detectors in a computed tom does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus and method for calibrating detectors in a computed tom, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for calibrating detectors in a computed tom will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2072864