SHARP X RAY SCAN
Publication Date: 2015-Oct-19
The IP.com Prior Art Database
An X ray exposure technique is disclosed that improves rendered sharpness of an imaging sequence The technique acquires images alternatively at different focal spot sizes Within an exposure sequence the technique includes shooting an object to image from time to time with a smaller focal source Shooting the object to image with a smaller focal source provides improved rendered sharpness while keeping X ray tube usage within thermal constraints For example one image is captured with a small X ray source followed by capturing four images with a large X ray source
The present invention relates generally to X-ray imaging systems and more particularly to a technique of improving rendered sharpness of X-ray imaging sequence.
Generally, X-ray systems, such as, radiography/fluoroscopy (R/F) applications, computed tomography (CT), vascular procedures and surgery acquire images with a single focal spot along a sequence to create a two dimensional (2D) image sequence. A gain in spatial resolution requires at X-ray tube level to switch to a smaller focal spot. However, switching to smaller focal spot, results in a shorter duration of X-ray tube availability, to compensate for thermal effect on the X-ray tube.
There are several conventional techniques known in the art that improve image quality of an imaging sequence. For example, a conventional technique utilizes dual voltage (kV) for contrast enhancement between soft and hard tissues. The dual voltage alternates within an image sequence. Another conventional technique includes alternate binning to balance limited bandwidth after conventional image acquisition. One other conventional technique employs dual spot operation with different physical location for stereo views or improved computed tomography (CT) resolution. Another conventional technique includes varying spot size during mammographic tomosynthesis operation or during a single image acquisition. However, the above mentioned conventional techniques are not effective in providing improvements in sharpness of X-ray image sequence.
It would be desirable to have an improved technique that provides improved sharpness of X-ray image at large frame rate.
BRIEF DESCRIPTION OF DRAWINGS
Figure 1 depicts graphs between X-ray source size and time and compares conventional exposure sequence with disclosed exposure sequence.
An X-ray exposure technique is disclosed that improves rende...