Assessing Radiation Dosage in Pediatric Head and Neck Computed Tomography Examinations During COVID-19 in a Tertiary Hospital in Saudi Arabia, Jeddah.

This study aimed to assess the practice of imaging and optimization of the radiation dose in pediatric head and neck computed tomography (CT) examinations during the coronavirus disease of 2019 (COVID-19) period. This study is based on a retrospective analysis of pediatric head CT records, conducted in the Radiology Department of the King Abdulaziz University Hospital in Jeddah, Saudi Arabia. We examined the data of all pediatric patients between 0 and 14 years of age who underwent head CT scans between March and September in both 2019 (before the COVID-19 pandemic) and 2020 (during the COVID-19 pandemic).

Low-magnetic field effect and electrically detected magnetic resonance measurements of photocurrent in vacuum vapor deposition films of weak charge-transfer pyrene/dimethylpyromellitdiimide (Py/DMPI) complex.

Magnetic field effect (MFE) and electrically detected magnetic resonance (EDMR) measurements of photocurrent have been conducted to clarify the excited-state dynamics in films of an organic weak charge-transfer (CT) complex, Pyrene/Dimethylpyromellitdiimide (Py/DMPI), fabricated by vacuum vapor deposition. Low-field MFE measurements of the photocurrent were carried out using an interdigitated platinum electrode made on a quartz substrate as well as the re-examination of the photocurrent and MFE in the range of 3-200 mT. The spin-dependent carrier dynamics leading to the low-field MFE are reasonably simulated as the low-field effect due to the hyperfine mechanism in the radical-pair intersystem crossing, which was solved through the Liouville equations of the density matrix for the stepwise hopping model in the doublet electron-hole pair (DD pair mechanism).

Doctors' knowledge of the doses and risks of radiological investigations performed in the emergency department.

Objectives: To assess emergency doctors' knowledge of radiation exposure doses and risks, and the increasing use of radiological investigations in emergency medicine practice is very concerning because of the associated risks of cancer.

Methods: Doctors from different specialties and with different levels of training working in emergency departments of 8 hospitals in Jeddah, Kingdom of Saudi Arabia, filled out a questionnaire. Participants estimated the radiation doses of different imaging modalities and answered questions regarding possible associated risks.

Patterns, knowledge, and barriers of mammography use among women in Saudi Arabia.

To assess mammography utilization and knowledge, and to determine barriers associated with mammography utilization among Saudi women. Methods: We conducted a cross-sectional survey in 5 main geographic regions of Saudi Arabia from February 2015 to May 2015. The sample comprised women aged ≥40 years.

Photoconductivity and magnetoconductance effects on vacuum vapor deposition films of weak charge-transfer complexes.

Thin films of weak charge-transfer (CT) complexes (pyrene/dimethylpyromellitdiimide or pyrene/pyromellitic dianhydride) were prepared on an interdigitated platinum electrode by vacuum vapor deposition. Their photoconductivity and magnetoconductance (MC) effects were investigated, and mobile triplet excitons (probably CT excitons) were detected by time-resolved ESR (TRESR) at room temperature. The MC effect on the photocurrent was observed and analyzed by quantum-mechanical simulation assuming two types of collision mechanisms between the electron and hole carriers and between the trapped triplet excitons and mobile carriers.