Laser positioning device and method for biplane radiotherapy

A laser positioning method for biplane radiotherapy, comprising following steps:

• S1, CT scanning and positioning, wherein CT scanning equipment comprises a laser positioning system, and the laser positioning system comprises a left laser plane, a right laser plane and a top laser plane;
• the left laser plane and the right laser plane are respectively provided with a beam of parallel fan-shaped laser line and two beams of vertical fan-shaped laser lines, and double cross-shaped laser lines are formed on left and right sides of a patient;
• the top laser plane is provided with two fan-shaped laser lines perpendicular to vertical laser lines in the left laser plane and the right laser plane respectively, and together with the two beams of vertical laser lines in the left laser plane and the right laser plane, a pound sign-shaped laser line is formed in chest and abdomen of the patient;
• S2, making marking lines on the patient's body surface according to results of the CT scanning and positioning;
• S3, setup:
• a linear accelerator comprises a same laser positioning system as a CT machine, and by adjusting the patient's position on the linear accelerator, the marking lines on the body surface are aligned with the laser positioning line of the linear accelerator;
• and
• S4, performing treatment.