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Stereotactic Body Radiation Therapy
Cancer is one of the major health concerns worldwide, and the proportion of cancer
patients requiring radiotherapy (RT) is increasing because of the increase in the
number of cancer patients. In Japan, the average life span is 80 years for men and
86 years for women as of 2014. Because of the comorbidities of an aged population,
less invasive radiotherapy is more preferred than invasive surgery. In most cases,
radiotherapy could be most effective and convenient.
Emerging new technologies have been widely introduced in the field of radiotherapy in recent decades. One of these, stereotactic radiotherapy (SRT), was first
used in intracranial tumors in the 1960s. Later, this technique was introduced for
extracranial tumors, mainly for lung cancer. One of the leading countries in this
field is Japan, where, since the 1990s, various developments, new biological and
physics concepts, new imaging modalities, new respiratory gating techniques, and
new image-guided radiation therapy (IGRT) machines have become available.
Recently, the technique of stereotactic body RT (SBRT) has taken a completely
different form from that of the original technique.
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