PO-0945: Controlling motion in radiotherapy: rapid shallow ventilation for thoracic and abdominal targets

An analysis of thoracic and abdominal tumour motion for stereotactic body radiotherapy patients.

An analysis of thoracic and abdominal tumour motion for stereotactic body radiotherapy patients was performed using more than 70 h of tumour motion estimated from the correlation between the external and internal motion for 143 treatment fractions in 42 patients. The tumour sites included lungs (30 patients) and retroperitoneum (12 patients). The overall mean respiratory-induced peak-to-trough ...

A study on the accuracy of motion tracking of thoracic tumors at radiotherapy with external surrogates

Introduction: In radiotherapy with external surrogates, exact information of tumor position is one of the key factors that improves treatment delivery. Many dynamic tumors in thorax region of patient move mainly due to respiration and are known as intra-fractional motion error that must be compensated, as well. One of clinical strategy is using Stereotactic Body Radiation Thera...

Simple contrivance "clamps" end-tidal PCO(2) and PO(2) despite rapid changes in ventilation.

The device described in this study uses functionally variable dead space to keep effective alveolar ventilation constant. It is capable of maintaining end-tidal PCO(2) and PO(2) within +/-1 Torr of the set value in the face of increases in breathing above the baseline level. The set level of end-tidal PCO(2) or PO(2) can be independently varied by altering the concentration in fresh gas flow. T...

Radiotherapy in thoracic neoplasms.

A Strong Ground Motion Catalogue of Selected Records for Shallow Crustal, Near Field Earthquakes in Iran

Understanding strong ground motions in the near-fault areas is important for seismic risk assessment in densely populated areas. In the past, lack of information on strong ground motion for large and moderate earthquakes led to the use of mainly far field large and moderate earthquake records in equations for calculation of the strong ground motion parameters. In this article, we collected and ...