The evolution of lead halide perovskites used for X-ray imaging scintillators has been facilitated by the development of solution-processable semiconductors characterized by large-area,flexible,fast photoresponse.The ...The evolution of lead halide perovskites used for X-ray imaging scintillators has been facilitated by the development of solution-processable semiconductors characterized by large-area,flexible,fast photoresponse.The stability and durability of these new perovskites are insufficient to achieve extended computed tomography scanning times with hard X-rays.In this study,we fabricated a self-assembled CsPbBr_(3)-based scintillator film with a flexible large-area uniform thickness using a new roomtemperature solution-processable method.The sensitivity and responsivity of X-ray photon conversion were quantitatively measured and showed a good linear response relationship suitable for X-ray imaging.We also demonstrated,for the first time,that the self-assembled CsPbBr_(3)-based scintillator has good stability for hard X-ray microtomography.Therefore,such an inexpensive solution-processed semiconductor easily prepared at room temperature can be used as a hard X-ray scintillator and equipped with flexible CsPbBr3-based X-ray detectors.It has great potential in three-dimensional high-resolution phase-contrast X-ray-imaging applications in biomedicine and material science because of its heavy Pb and Br atoms.展开更多
Colonic volvulus is a relatively uncommon cause of large bowel obstruction usually involving mobile,intraperitoneal,colonic segments.Congenital or acquired anatomic variation may be associated with an increased risk o...Colonic volvulus is a relatively uncommon cause of large bowel obstruction usually involving mobile,intraperitoneal,colonic segments.Congenital or acquired anatomic variation may be associated with an increased risk of colonic volvulus which can occasionally involve retro-peritoneal segments.We report a case of 54-year-old female who presented to our Institution to perform a plain abdominal film series for acute onset of cramping abdominal pain.Both the upright and supine films showed signs of acute colonic obstruction which was thought to be due to an internal hernia of the transverse colon into the lesser sac.The patient was therefore submitted to a multi-detector contrast-enhanced computed tomography(CT).CT findings were initially thought to be consistent with the presumed diagnosis of internal hernia but further evaluation and coronal reformatting clearly depicted the presence of a colonic volvulus possibly resulting from a retro-gastric colon.At surgery,a volvulus of the ascending colon was found and a right hemi-colectomy had to be performed.However,a non rotated midgut with a right-sided duodeno-jejunal flexure and a left sided colon was also found at laparotomy and over-looked in the pre-operative CT.Retrospective evaluation of CT images was therefore performed and a number of CT signs of intestinal malrotation could be identified.展开更多
基金supported by National Natural Science Foundation of China (No. 12175127)Natural Science Foundation of Shandong Province,China (No. ZR2020MA088)
文摘The evolution of lead halide perovskites used for X-ray imaging scintillators has been facilitated by the development of solution-processable semiconductors characterized by large-area,flexible,fast photoresponse.The stability and durability of these new perovskites are insufficient to achieve extended computed tomography scanning times with hard X-rays.In this study,we fabricated a self-assembled CsPbBr_(3)-based scintillator film with a flexible large-area uniform thickness using a new roomtemperature solution-processable method.The sensitivity and responsivity of X-ray photon conversion were quantitatively measured and showed a good linear response relationship suitable for X-ray imaging.We also demonstrated,for the first time,that the self-assembled CsPbBr_(3)-based scintillator has good stability for hard X-ray microtomography.Therefore,such an inexpensive solution-processed semiconductor easily prepared at room temperature can be used as a hard X-ray scintillator and equipped with flexible CsPbBr3-based X-ray detectors.It has great potential in three-dimensional high-resolution phase-contrast X-ray-imaging applications in biomedicine and material science because of its heavy Pb and Br atoms.
文摘Colonic volvulus is a relatively uncommon cause of large bowel obstruction usually involving mobile,intraperitoneal,colonic segments.Congenital or acquired anatomic variation may be associated with an increased risk of colonic volvulus which can occasionally involve retro-peritoneal segments.We report a case of 54-year-old female who presented to our Institution to perform a plain abdominal film series for acute onset of cramping abdominal pain.Both the upright and supine films showed signs of acute colonic obstruction which was thought to be due to an internal hernia of the transverse colon into the lesser sac.The patient was therefore submitted to a multi-detector contrast-enhanced computed tomography(CT).CT findings were initially thought to be consistent with the presumed diagnosis of internal hernia but further evaluation and coronal reformatting clearly depicted the presence of a colonic volvulus possibly resulting from a retro-gastric colon.At surgery,a volvulus of the ascending colon was found and a right hemi-colectomy had to be performed.However,a non rotated midgut with a right-sided duodeno-jejunal flexure and a left sided colon was also found at laparotomy and over-looked in the pre-operative CT.Retrospective evaluation of CT images was therefore performed and a number of CT signs of intestinal malrotation could be identified.
