| dc.contributor.advisor | reznik, alla | |
| dc.contributor.author | thibault, tristen | |
| dc.date.accessioned | 2023-01-25t17:33:20z | |
| dc.date.available | 2023-01-25t17:33:20z | |
| dc.date.created | 2022 | |
| dc.date.issued | 2022 | |
| dc.identifier.uri | https://knowledgecommons.lakeheadu.ca/handle/2453/5058 | |
| dc.description.abstract | high atomic number (z) polycrystalline and amorphous photoconductors are currently
being investigated to extend direct conversion x-ray detectors to real-time and high-energy lowdose applications. amorphous lead oxide (a-pbo) is one of the most promising photoconductor
candidates because of its negligible signal lag and high theoretical x-ray conversion efficiency.
however, a-pbo layers are still experimental; pbo technology has been developed to the point
where material science and engineering approaches must be applied to make a-pbo detector
prototypes suitable for low-dose x-ray imaging. this includes determining the most appropriate
a-pbo multilayer detector structures with specially designed blocking layers that will withstand
the high electric fields needed for efficient (i.e., complete) collection of x-ray generated charge
while maintaining an acceptable dark current (dc) level. dc is a source of noise in the detector
structure that degrades the signal-to-noise ratio (snr) of the detector system in low-exposure
applications. here we investigate the use of polyimide (pi) as a hole-blocking layer. pi blocking
layers were proven successful in the only commercially used direct conversion detectors, which
are based on layers of photoconductive amorphous selenium (a-se). experimentally, pi was shown
to have the most suitable electrical and physical properties for our a-pbo technology. in addition,
pi has a straightforward application process of spin coating. therefore, pi was chosen as a hole
blocking layer to decrease dc to tolerable levels in an a-pbo-based detector. [...] | en_us |
| dc.language.iso | en_us | en_us |
| dc.subject | anatomical medical imaging | en_us |
| dc.subject | x-ray medical imaging | en_us |
| dc.subject | pbo technology | en_us |
| dc.subject | x-ray-induced photocurrent method | en_us |
| dc.title | dark current modeling and characterization of amorphous lead oxide-based x-ray photoconductive devices for applications in medical imaging | en_us |
| dc.type | thesis | en_us |
| etd.degree.name | master of science | en_us |
| etd.degree.level | master | en_us |
| etd.degree.discipline | physics | en_us |
| etd.degree.grantor | 阿根廷vs墨西哥竞猜
| en_us |
| dc.contributor.committeemember | linhananta, apichart | |
| dc.contributor.committeemember | gallagher, mark | |
