BOOK_CONTENT
From Ionizing Radiation Detectors For Medical Imaging
Willi A. Kalender, Theobald O.J. Fuchs,
Institute of Medical Physics, University of Erlangen-N rnberg
Germany

4.1 Introduction

Within this chapter we will discuss most of the requirements on X-ray detectors which are specific to Computed Tomography (CT) scanners. In order to facilitate a detailed understanding of the special properties a detector should provide for CT measurement, we will give a short introduction into the basics of CT measurement, the standard configuration of modern clinical CT systems and some typical performance parameters of a typical CT scanner. This will include the mechanical and geometrical set-up, special alignment features, the X-ray source, filtration and collimation. In the following, the physical detector principles and properties and their influence on image quality are discussed. Wherever necessary we will take into account modern concepts for multi-row detectors which are state of the art with the latest generation of modern clinical CT scanning units. Special fields of medical CT such as >dimensional (3D) angiography or non-destructive material testing with Micre-CT will be addressed in the outlook. Although there is very interesting work going on in these fields, we will not treat these topics in great detail, but rather focus this contribution on modern clinical CT systems for standard radiological applications.

4.2 Basic Principle of CT Measurement and Standard Scanner Configuration

To be able to compute an image in acceptable quality following Radon's theory, a sufficiently high number of attenuation integrals or projection values have to be recorded. It is necessary to carry out measurements in all directions,...

Copyright World Scientific Publishing Co. Pte. Ltd. 2004 under license agreement with Books24x7

Products & Services
Turbidity Instruments
Turbidity instruments measure the average volume of light scattering over a defined angular range. Both particle size and concentration of suspended solids as well as dissolved solids can affect the reading.
Security System Services
Security system services install, maintain, and monitor security equipment such as CCTV systems, security cameras, building monitors, entry alarms, metal detectors, and movement and occupancy sensors.
Dimensional and Profile Scanners
Dimensional and profile scanners gather two-dimensional (2D) or three-dimensional (3D) information about an object.
Radiation Detectors
Radiation detectors are used for medical diagnoses, radioactive dating measurements, and measurements of background radiation, activity levels and radiation doses.

Topics of Interest

Ralf-Hendrik Menk, Sincrotrone Trieste S.C.p.A. di interesse nazionale Strada Statale 14 - km 165,5 in AREA Science Park 34012 Basovizza, Trieste, ITALY 5.1 Introduction Worldwide synchrotron...

PATRICK J. LA RIVI RE University of Chicago, Department of Radiology and Committee on Medical Physics, 5841 S. Maryland Ave., MG- 1037 Chicago, IL 60637, USA pjlarivi@midway.uchicago.edu One of the...

Medical Device & Diagnostic Industry Like voyagers looking at their world in pre-Columbian times, physicians have been trained to look at their patients as if they were flat. For more than a...

Alberto Del Guerra, Department of Physics, University of Pisa and INFN, Sezione di Pisa Pisa, Italy (e-mail: alberto.delguerra@djunipi.it) 1.1 Medical Imaging The enormous development in detectors...

Medical Device & Diagnostic Industry Computed tomography is making a bid to recapture the high ground of medical imaging. A decade has passed since any significant changes have been made in either...