Real-time eye lens dose monitoring during cerebral angiography procedures

Abstract

Objectives: To develop a real-time dose-monitoring system to measure the patient's eye lens dose during neuro-interventional procedures. Methods: Radiation dose received at left outer canthus (LOC) and left eyelid (LE) were measured using Metal-Oxide-Semiconductor Field-Effect Transistor dosimeters on 35 patients who underwent diagnostic or cerebral embolization procedures. Results: The radiation dose received at the LOC region was significantly higher than the dose received by the LE. The maximum eye lens dose of 1492 mGy was measured at LOC region for an AVM case, followed by 907 mGy for an aneurysm case and 665 mGy for a diagnostic angiography procedure. Strong correlations (shown as R2) were observed between kerma-area-product and measured eye doses (LOC:0.78, LE: 0.68). Lateral and frontal air-kerma showed strong correlations with measured dose at LOC (AKL:0.93, AKF:0.78) and a weak correlation with measured dose at LE. A moderate correlation was observed between fluoroscopic time and dose measured at LE and LOC regions. Conclusions: The MO Skin dose-monitoring system represents a new tool enabling real-time monitoring of eye lens dose during neuro-interventional procedures. This system can provide interventionalists with information needed to adjust the clinical procedure to control the patient's dose. Key Points • Real-time patient dose monitoring helps interventionalists to monitor doses.• Strong correlation was observed between kerma-area-product and measured eye doses.• Radiation dose at left outer canthus was higher than at left eyelid

Monte Carlo-based patient internal dosimetry in fluoroscopy-guided interventional procedures: A review

“…As defined, direct measurement can be conducted by either placing the dosimeter on the patient's skin surface or inserting it within an anthropomorphic phantom. Various dosimeters have been used in the literature, such as TLD (thermo-luminescent dosimeter), OSLD (optically stimulated luminescent dosimeter), RPLGD (radio-photoluminescent glass dosimeter), MOSFET(Metal-oxide-semiconductor field-effect transistor), MOSkin detector, thin-film detector, and radiochromic film [15][16][17][18][19][20][21].…”

Knowledge deficiency of work-related radiation hazards associated with psychological distress among orthopedic surgeons

“…However, the inconvenient truths were that only 4.51% participants wore leaded glasses to protect their eyes, although the eye was one of the most sensitive organs to radiation exposure [ 34 ] . Only 19.17% participants reported wearing real-time dosage monitor, although real-time dosage monitor was well validated strategy to minimize radiation exposure [ 35 ] . Only 30.45% participants reported wearing thyroid gland shield, although radiation-induced thyroid cancer has been well documented.…”

Measurement of Patient Lens Exposure during Cerebral Endovascular Treatment Using a Scintillation Optical Fiber Dosimeter

“…Kawauchi et al 15) reported that left lens exposure on diagnostic cerebral angiography was significantly higher than right lens exposure. Furthermore, Safari et al 13) placed a MOSFET dosimeter on the eyelid from the lateral side of the left eye for lens dose monitoring. This was because a lateral X-ray tube had been installed on the left side of the patient.…”

“…Safari et al 13) measured the real-time lens dose using a MOSFET dosimeter for endovascular diagnosis/treatment of the head area. However, concerning the dose measured, the characteristics of the dosimeter were not considered, and the value may have been markedly influenced by the directional dependency of the MOSFET dosimeter.…”