ABSTRACT
The decreased occupational dose limit for eye lens has lead to an extensive focus on the eye lens dose monitoring and protection for occupational staff in interventional procedures.Based on the literature investigation of existing measurement and calculation results,the efficiency and influence factors of eye lens protective equipments for interventional staff are analyzed,and the suggestions for selection and use of them are provided.The main contribution to the eye lens dose to interventional staff is unshielded radiation which reaches the eyes directly.The key factors to inflence the efficiency of eye lens protective equipment is the geometric conditions such as structure,beam projection,position arrangement and operator postures,instead of lead equivalent thickness.Equipment of 0.5 mm lead equivalent thickness is enough to protect the eye lens of interventional staff.The combination of lead glasses and lead barrier can provide better protection in clinical practice.
ABSTRACT
OBJECTIVE@#To explore the appropriate reconstructive methods and curative effect after nasal skin malignant tumor excision.@*METHOD@#Nasolabial flap was selected to cover the nasal defects in 15 cases which nasal tumors were removed. The secondary defect of donor site was directly sutured. Electron beam conventional radiotherapy (DT40-50 Gy/20-25 times/4-5 weeks) was delivered to the involved field after incision sutured out 2-5 days.@*RESULT@#A total of 15 patients with nasal tumor were available for follow-up of 6 to 24 months, no tumor recurrence occurred, and the repaired tissue were good match with surrounding tissue, good nasal contour was obtained with an inconspicuous scar.@*CONCLUSION@#These data indicate that the nasolabial flap can be used to repair defects of the nose tumors in 15 cases and is surgically convenient. Combination of nasolabial flap repairing and postoperative local electron beam irradiation, inhibited the recurrence of nose tumor effectively, is an ideal method.