USE HANDOUT TABLES FOR THE FOLLOWING CALCULATIONA patient is…

USE HANDOUT TABLES FOR THE FOLLOWING CALCULATIONA patient is treated on a 6 MV linac treatment machine at 100 cm SSD to his left hip.  The patient is supine and is being treated through a single field.  The collimator setting is 17 x 12 cm.  Some blocking is used to shape the field and the EFS is determined to be 12 x 12 cm.  The blocks are mounted on a slotted lucite tray which is       5 mm in thickness.  The prescription states that a dose of 3000 cGy is to be delivered to a depth of 5 cm in 10 fractions.  Calculate the MUs per fraction.Calculate the treatment time.

A patient is treated on the 6 MV linear accelerator treatmen…

A patient is treated on the 6 MV linear accelerator treatment machine at 100 cm SAD.  The treatment SSD is 90 cm.  The prescription states that a dose of 4000 cGy is to be delivered to a depth of 10 cm in 20 fractions with an AP/PA treatment field arrangement.  If the patient’s spinal cord lies at a depth of 6 cm beneath the patient’s posterior skin surface, what is the depth to the spinal cord from the anterior skin surface?