ABSTRACT
Objective To discuss the three-dimensional conformal radiotherapy(3D-CRT) plan for pancreatic tumors.Methods The 3D-CRT plan of 30 cases of primary pancreatic cancer were designed according to the request of the doctors for PTV and the restricted receiving dose of the peripheral normal sensitive organs.The best plan was chosen referring the dose-volume histogram.Results By using ICRU dose reference point(the central point of target)as theunitary dose,95% dose line could be surrounded above 95% of the PTV.Conclusion The focus in different localization can be treated with different design in treating the pancreatic tumors.The reaction to radiotherapy is directly influenced by the volume and dosage of radiation to the normal hepatic tissues.
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Objective To introduce the clinical design of the portable and moveable laser light for simulation immobilization.Methods According to the theory of the laser immobilization system,the setting is designed by using current material,such as a ruler of ?-shape and pillar-shape laser light etc.After installation and adjustment,it is used in clinic.Results Patient can be immobilized by CT and this setting.Being simple to operate and convenient to use,this setting can act for the expensive laser position system.Conclusion The material and creation of this setting are rougher,so it needs improvement to insure the accuracy of position.
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It is not only a radiotherapy reform but a practical and effective treatment that the moulding of low-melting-point lead is used to supplement conventional and normal lead block.Based on clinical practice,the significance and implementation of integrated block are discussed in this paper.
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Objective To investigate and carry out the function of the lead block validating instrument in the radiotherapy. Methods Based on clinical practice and the principle comparative steady STD and SAD of linear accelerator, the function of lead block validating instrument was developed in reason. Results The working quality and efficiency are greatly improved. Conclusion Not only the criterion extent of founded lead block and the proof of every kinds spume blocks in three-dimensional conformal radiotherapy and integer block radiotherapy and electron radiotherapy, but also the shadow tray centers and center reticle can be validated by the lead block validating instrument.
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Objective To apply lead block technology to the interdiction of X-ray destroy from linear accelerator to normal tissues and sensitive organs so as to treat large fields and irregular malignant lymphoma.Methods The steps were as follows:(1)immobilizing patients;(2)simulator photographing;(3)sketching targets;(4)tailoring lead block;(5)validating lead block.Results Problems of large fields and more targets were solved in radiotherapy for malignant lymphoma patients.Conclusion Based on clinical practice,new methods was found for realizing large irregular radiation fields.