National Diagnostic Reference Levels for Nuclear Medicine in Kuwait.

The diagnostic reference level (DRL) is a patient-exposure optimization tool used to evaluate and provide guidance for radiation doses in medical imaging. In the past few decades, there has been a global increase in the number of diagnostic imaging procedures, including nuclear medicine procedures, and consequently in patient radiation exposure. This increase has encouraged international and national health-care organizations to take action and keep up with such changes to meet the expectation of increasing use of ionizing radiation in medicine. Methods: DRLs in Kuwait were established by investigating the administered activity of radiopharmaceuticals and CT radiation doses in hybrid imaging systems. The DRLs were determined on the basis of the 75th percentile of radiopharmaceutical administered activity distribution as recommended by the International Commission on Radiological Protection. Results: The DRLs determined in Kuwait agree well with other published DRLs in Europe, Japan, Korea, Australia, and the United States. Conclusion: This study presents the establishment process and the results of the first national DRLs for nuclear medicine procedures in Kuwait as a way to optimize radiation exposure.

Estimation of patient effective doses in PET/CT- 18F-Sodium Fluoride examinations.

The positron emitters (18F-Sodium Fluoride (NaF)) and X-rays used in Positron emission tomography (PET) combined with computed tomography (PET/CT) imaging have a high radiation dose, which results in a high patient dose. The present research intends to determine the radiation dose and risks associated with PET/CT- 18F-Sodium fluoride examinations in patients. The 18F-NaF PET/CT was used to investigate the doses of 86 patients. Patient exposure parameters and ImPACT software were used to calculate mean effective doses. The administered activity of 185 MBq (5.0 mCi) per procedure has a mean and range based on the patient's BMI (BMI). The range of patient effective doses per procedure was found to be 4-10 mSv, with a radiation risk of 1 × 10-5 per procedure. Patient doses are determined by the patient's size, scanner type, imaging protocol, and reconstruction method. For further dose reduction, proper justification and radiation dose optimization is required.

Assessment of eye doses to staff involved in interventional cardiology procedures in Kuwait.

In this study, which is the first of its kind in the gulf region, eye doses of interventional cardiologists and nurses were measured using active dosimeters for left and right eyes, in 60 percutaneous coronary interventions in three main hospitals in Kuwait. The dose given in terms of Hp(0.07) per procedure when ceiling suspended screens were used by main operators ranged from 18.5 to 30.3 µSv for the left eye and from 12.6 to 23.6 µSv for the right eye. Taking into account typical staff workload, the results show that the dose limit of 20 mSv/year to the eyes can be exceeded for interventional cardiologists in some situations, which demonstrates the need of using additional effective radiation protection tools, e.g. protective eye spectacles, in addition to the regular and proper use of ceiling suspended screens. With indications of increase in workload, the need for availability of a dedicated active dosimeter for the regular monitoring of eye doses is emphasized.