You are taking daily orthogonal films on a patient with a mediastinal mass. It is hard to identify the borders of the planned target volume. What structure/s could you use as an internal fiducial to verify your isocenter in the treatment portal?
Read DetailsYou are treating a lumbar spine metastasis from the patient’s lung cancer on an Elekta linear accelerator with a calculated SSD of 100 cm. The patient is able to lay prone. She begins treatment on Monday, May 24. The doctor has ordered 14 fractions to a total dose of 3500 cGy. The doctor orders that the patient be treated non-isocentrically. Her AP/PA separation is 36 cm. The spine lesion is 7 cm from her posterior aspect. May 31 is Memorial Day and the cancer center is closed, there will be no treatments that day. Your patient calls you on Tuesday 6/1 and tells you she cannot make it in for treatment because she went out of town for the Memorial Day weekend and could not get home. What is her elapsed day on 6/2?
Read DetailsYour patient is being treated for cervical cancer. The patient is being treated on a Varian 2100 CD machine (calculated SSD 100cm). She is undergoing a 4-field box treatment that includes the inguinal lymph nodes. Your patient had a total hysterectomy before beginning radiation therapy and the doctor is prescribing the dose to the surgical bed. The treatment isocenter is located 14.8 cm deep from the anterior surface. The treatment isocenter is also located 22.4 cm from the patient’s right lateral. Your patient is 29.6 cm thick and from left to right 44.8cm. What is the tumor distance from the patient’s posterior aspect?
Read DetailsA woman comes for simulation of her left breast. She has had a lumpectomy and she is to begin her treatment in 1 week. The immobilization device used is a slanted breast board and her simulation is done on a CAT scan machine. What is the purpose of the slanted breast board?
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