Conseils d’achat Linear Accelerator
- Facilities should select the radiotherapy unit based on the range of energies required and ease of patient setup.
- Due to the high price of radiotherapy units, facilities need to carefully assess their needs and choose a versatile linear accelerator unit (LINAC)that can meet their needs.
- Many different linear accelerator designs are available from various manufacturers, who offer a slightly different approach to device design. There is no sufficient data to show the clinical superiority of a particular radiotherapy unit’s design.
- Different models offer various numbers and sizes of collimator leaves.
- The main differences between low, mid, and high-energy LINACs are the photon and electron energy ranges. Buyers should choose the appropriate linear accelerator type based on the main uses of the unit.
- The cobalt units, much like the low energy linear accelerators, are mainly used for treating bone cancer and head, neck, and breast tumors.
- For treating deep-seated neoplasms and tumors of the pelvis and thorax, higher energy LINACs are used. These can also produce low-energy beams, and therefore are capable of more applications than lower-energy linear accelerators. However, they are significantly more expensive.
- The accelerator can be either a travel or standing wave accelerator for all types of LINACs. The microwave power source can be either magnetron or klystron, and the gantry rotation range should be 360°.
- Linear accelerator s should have multileaf collimators with at least 40 leaves.
- For x-rays, the collimators should define fields of 40 × 40 cm. For electrons, they should be 25 × 25 cm.
- Radiation treatment requires a wide range of photon and electron energy and treatment field sizes due to the fact that cancerous tumors occur at different depths and locations within the body.
- Approximately 60% of patients require low-energy therapy, 25% of patients require medium to high-energy therapy, and 15% require a high-energy electron beam.
- Before installation of a radiotherapy unit, the shielding requirements should be determined by a medical physicist. Due to the higher doses, IMRT may require additional shielding.
- For calibrating radiotherapy units and identifying operating irregularities, buyers should establish a comprehensive quality assurance program.
Guide d'achat de matériel médical
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