title: Reducing computed tomography radiation dose in diagnosing pulmonary embolism.
abstract: OBJECTIVE
  Computed tomography angiography plays a major role in the diagnosis of pulmonary embolism. Radiation dose associated with it is a major concern; therefore it is important to optimize protocols and techniques to ensure minimum radiation dose.
  
  
  METHODS
  The study compares two protocols i. Conventional Timing Bolus CT protocol and Delayed Timing Bolus protocol used to assist suspected pulmonary embolism patients.
  
  
  RESULTS
  A significant reduction in the average effective dose (39%) was noticed when using the delayed timing bolus protocol.
  
  
  CONCLUSIONS
  Delayed timing bolus protocol has a good impact on radiation dose without affecting the value of the computed tomography angiography study.
authors.affiliation: Tamader Y. AL-Rammah, Department of Radiological Sciences, College of Applied Medical Sciences, King Saud University, Saudi Arabia.
authors.forename: Tamader Y
authors.initials: TY
authors.lastname: Al-Rammah
authors.affiliation: Amani Alohaly, Department of Radiological Sciences, College of Applied Medical Sciences, King Saud University, Saudi Arabia.
authors.forename: Amani
authors.initials: A
authors.lastname: Alohaly
authors.affiliation: Kamal Albatsh, King Khalid University Hospital, King Saud University, Saudi Arabia.
authors.forename: Kamal
authors.initials: K
authors.lastname: Albatsh
keywords: Computed tomography angiography; Computed tomography dose index; Dose length product; Effective dose; Pulmonary embolism