Slot Scanning Mammography

1. Slot Scanning Mammography Imaging
2. Slot Scanning Mammography Center

Digital Slot Scan Mammography Using CCDs

Slot Scanning Mammography Imaging

1. An amorphus selenium (a-Se) flat-panel detector was modified to implement the ALER technique for slot-scan imaging. A stepping-motor driven fore-collimator was mounted in front of an X-ray tube to generate a scanning X-ray fan beam. The scanning speed and magnification were adjusted to synchronize the fan beam motion with the image line readout.
2. Slot Scan function is easy-to-use and frequently used for routine radiography. And end points Check images as Fig. Slot Scan Ease-of-Use Fig. 3 shows flowcharts of the work flow for cassette radiography and Slot Scan radiography. The conventional CR long-length imaging operation is complex. It requires switching the IP and reading.
3. Early studies and clinical trials show that DBT is an improvement over full field digital mammography (FFDM) because it provides the radiologist with better image quality and more information.OBJECTIVE: This paper presents a simulation system to model the performance of a slot-scanning FFDM and DBT system.METHODS: A tissue-equivalent three.

Slot scanning mammography was developed a decade ago 7 and provides one way to reduce scattered radiation in measurements. Prior implementations were designed with a moving x-ray source, stationary slit, and moving detector. The slot-scanning system evaluated in this paper was obtained through a grant from the Canadian Foundation for Innovation. The evaluation was supported through research funds by Biospace Med, the company producing the new slot-scanning device that is the subject of this manuscript.

Abstract

A desirable mammography imaging system should offer high spatial resolution, high sensitivity, a wide dynamic range and a means of limiting detected x-ray scatter. Significant scatter reduction can be obtained with a slot scan acquisition format with minimal attenuation of the primary beam. A potential receptor for digital mammography is comprised of a x-ray screen optically coupled directly to a CCD detector. The dynamic range of our current front-illuminated CCD is about 400 using factory supplied readout circuitry. The high spatial resolution of the CCD (22.4 1p/mm at Nyquist frequency) and the x-ray screen are reduced by poor optical contact at this time. X-rays which interact with the2CCD generate a moderate signal (25-30% of the optical signal) when a thin (22mg/cm²) Gd₂O₂S:Tb screen is used. Image segments of a Kodak breast phantom were acquired with both the screen-CCD detector and the CCD detector alone. Substantial improvements in detector performance could be achieved by utilizing a back-illuminated CCD with a slow scan, correlated double sampled readout and a structured x-ray screen. The concept of direct optical coupling with structured screens can be implemented in high energy digital scanning systems.

Slot Scanning Mammography Center

Publication:

Pub Date:

January 1987

DOI:

10.1117/12.966986

Bibcode:

1987SPIE..767..102N