A 3D microtomographic system with stacked fan-beam geometry
- 作者：Kohlbrenner ; Adrian ; Hä ; mmerle ; Stefan ; Laib ; Andres ; Rü ; egsegger ; Peter
- 关键词：87.59.Fm ; 87.64.-t ; CT ; Tomography ; Microtomography ; CCD ; 3D imaging ; High-speed scanning
- 刊名：Nuclear Instruments and Methods in Physics Research Section A ; Accelerators ; Spectrometers ; Detectors and Associated Equipment
- 出版年：2000
- 期刊代码：41_01689002
- 类别：ph
- 出版时间：April 1, 2000
- 卷：443
- 期：2-3
- 页码：531-539
- 文件大小：666 K
摘要
The move from 2D to 3D analysis, and the increase in spatial resolution characterize recent improvements in CT-based structure assessment. A new desktop micro-CT system with high scanning speed has been developed. The instrument makes use of a novel multiple fan-beam technique: radiation from a line-focus X-ray tube is divided into a stack of fan-beams by a foil collimator with a 30 μm pitch. The stacked fan-beam geometry allows to design compact CT scanners with a source-to-detector distance of only 18 cm. The complete system fits into a standard 19 in. rack. Image reconstruction is based on standard fan-beam algorithms, which eliminates the difficulties and limitations associated with cone-beam reconstruction. The detector comprises a low-noise area CCD sensor, a fiber-optic light guide and a scintillator screen. A complete examination requires 2 min only. The new micro-CT system has a voxel size of 20×20×26 μm3. Each 3D image contains a quarter of a billion voxels or a multiple of it. Samples up to 20 mm in diameter and up to 40 mm in length can be imaged. The instrument can be operated in a normal lab environment.