ABSTRACT
With aligned MR registration, the MR-Linac provides superior soft tissue resolution for prostate cancer. No fiducial markers or electromagnetic transponders insertion is needed to guarantee high-precision radiotherapy. The highly-recommended Adapt-To-Shape (ATS) workflow can resolve all the problems encountered during prostate cancer radiotherapy, including prostate volume changes and adjacent organs motion, both inter-fractionally and intra-fractionally. With all the above advantages, MR-Linac performs outstandingly than conventional linac in prostate cancer RT delivery, and probably helps us to reduce the CTV-PTV margin safely in the near future. Nevertheless, it is difficult to implement the ATS workflow in clinical practice. In this article, the standard ATS workflow for prostate cancer was summarized based on our own experience.
ABSTRACT
Objective To research and design a kind of high accuracy laser power density meter to measure laser power density in clinical medicine,in order to combine laser with clinical medicine well.Methods The pyroelectric detector was used to convert the laser signal to available electrical signal,preamplifier filter circuit and control circuit were designed to match the detector,and C was used for software programming.With the combination of hardware and software design,a high precision laser power density meter was developed,which was based on AVR microcontroller.Results The instrument could measure the minimum 1 mW/cm2 of laser power density accurately and the error rate was 2％,which met the requirements of the laser power density meter parameters in medical application.Conclusion The power density meter has a high precision,small error rate and good stability,and it can measure the laser power density accurately.
ABSTRACT
Technological advances that have been achieved over the last two decades in the area of treatment planning and sophisticated and complicated hardware capabilities, such as computer-controlled treatments, multileaf collimators, and incorporating imaging devices into treatment machines, enable clinical implementation of high-precision radiotherapy in field of radiation oncology. High-precision radiotherapy allows the delivery of increased tumor doses with relative sparing of normal tissues compared to 3 -dimensional radiotherapy and conventional techniques. Preliminary clinical experiences of high precision radiation therapy have been encouraging by high rates of local control and decrease of toxicity. This article provides an overview of high precision radiotherapy such as intensity-modulated radiotherapy, stereotactic radiation therapy, image-guided radiotherapy, and charged particle therapy.