Exposure compensation for digital radiography systems using selective scanning of sensor arrays
US6256406A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1998 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Sep 16, 2018 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/583
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Diagnostic x-ray images having uniform optical density are generated by selectively scanning (806) lines of pixels (402) in a sensor unit (202) used to capture x-ray images in a digital radiography system (200). By selectively scanning (806) the lines of pixels (402), the exposure time of such pixels can be controlled. The lines of pixels (402) are selectively scanned (806) according to exposure compensation profiles (600) for the anatomic regions of interest. The exposure compensation profiles (600) include an ordered sequence of exposure times which can be loaded into a programmable timer (306) coupled to read out circuitry (304) located in the sensor unit (202). The timer (306) uses this ordered sequence of exposure times to determine which pixel line to access next, and when to initiate that access. The exposure compensation profiles (600) can be generated (802) from empirical data by taking (800) preliminary low dose exposures of the body parts to be examined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.