It provides a reference position, establishes three-dimensional spatial coordinate information, and can clearly display the patient's anatomical structure. The error variability is small, and the tissue electron density provides a basis for dose calculation.

The flat bed surface can be connected to the patient's fixture, the scanning coil can be adapted to the patient's fixture, and the inspection aperture is large (>70cm). The magnetic field is uniform, etc. In order to improve the accuracy of tumor target location, specific scanning sequences need to be used for tumors in different parts.

It can feed back tissue metabolism signals to distinguish the level of breathability in tumor tissue and provide rich information for tumor staging.

The content of regular inspections mainly includes hardware, software and data transmission. According to the length of the inspection cycle, it is divided into weekly inspection, monthly inspection, quarterly inspection and annual inspection.

Linear Accelerator

Ct simulator

After-loading treatment machine

Performance of personal meters and environmental monitors, battery and backup battery power detection

Equipment surface, ambient dose equivalent rate

Radioactive source placement accuracy

Maximum error and cumulative error of radioactive source positioning

Dwell time accuracy

sun, earth

X-ray machine, nuclear weapon explosion, nuclear power plant accident

Without protection, exposure to such sources can kill within minutes to an hour.

Without protection, exposure to such sources can lead to death within hours to days.

Without protection, exposure to such sources can cause permanent damage to humans within a few hours, and death can occur within days to weeks of exposure.

Basically it will not cause permanent damage to humans, but it may cause recoverable temporary damage to people who are exposed to the radioactive source at close range for a long time.

Will not cause permanent damage to people

random effects

Deterministic effect/non-random effect

recency effect

forward effect

Skin damage, reproductive organ damage, hematopoietic organ damage, digestive organ damage, central nervous system damage

cataracts, compromised immune system

cancer disease

genetic disease

highly sensitive organization

Moderate

B

Not sensitive

The annual effective dose does not exceed 1 msv

The average dose for 5 consecutive years does not exceed msv

The effective dose in a given year does not exceed 5 msv

The annual equivalent dose of the eye lens is 15 msv

The annual dose for skin is 50 msv

No one under the age of 16 may receive occupational exposure

Multi-leaf grating blocks rays