Apparatus engineering of C ray CT equipment(5) : Artifact(Basic Lectures-CT)

Artifacts in X-ray CT

Advanced X-ray computed tomography methods: High resolution CT, quantitative CT, 4DCT and phase contrast CT

During the last years, a number of novel X-ray imaging and data processing methods have been developed. This work gives an overview of some recent CT-developments: 1) High resolution CT: State of the art laboratory CT-systems are able to reach resolutions down to 0.7 μm (or even lower) and voxels sizes down to 50 nm. Several applications of high-resolution CT are presented and discussed. 2) Qua...

Investigation of dosimetric characteristic of NIPAM polymer gel using x-ray CT

Introduction: Polymer gel dosimeters contain chemical materials sensitive to the radiation which are polymerized by the radiation as a function of absorbed dose. So information of spatial dose distribution can be extracted by imaging from irradiated gel. Among imaging techniques, computed tomography (CT) poses as an attractive method because of practical advantages such as acce...

Dosimetry of Occupational Radiation around Panoramic X-ray Apparatus

Background: Panoramic imaging is one of the most common imaging methods in dentistry. Regarding the side-effects of ionizing radiation, it is necessary to survey different aspects and details of panoramic imaging. In this study, we compared the absorbed x-ray dose around two panoramic x-ray units: PM 2002 CC Proline (Planmeca, Helsinki, Finland) and Cranex Tome (Soredex, Helsinki, Finland).<br ...

Crcpd Survey of X-ray Ct Screening

1. The state regulates x-ray CT scanners Directly [i.e. identified as CT]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CA . . FL . . GA . . . . . . . IL . . . . . . . . . . . . . LA . MD . . . . . . . . . . . MS . MO NE . . NJ . . OR . . PA . . . . . . . UT . WV Indirectly [as a radiation machine] . . . . . . . . . . . . . . . . . . . . . . AL . . . . . . . . . . . . . . . . . . I...