Features
- In-vivo verification of IMRT treatments
- Full documentation without additional workload
- Dose recording in front of the patient
- Wireless data transmission via Bluetooth
- Comprehensive software package
- Based on the new MIC technology (Multiwire Ion Chamber Technology)
Verification of administered doses during patient treatment is very difficult in complex treatment methods such as IMRT. In-vivo dosimetry with semiconductors or TLDs requires additional work, for which there is often not sufficient time in daily routines. The DAVID measurement system makes it possible for the first time to verify doses without additional work or time.
Operating principle
A transparent multiwire ionization chamber (MIC) is installed below the MLCs. Measurement wires are stretched parallel to the running direction of the MLCs. Each measurement wire monitors the opening of a leaf pair. The measured dose length product is correlated to the opening of the leaf pair and the supplied dose. The evaluation software compares the dose measured during radiotherapy to a reference dose, which was taken for each leaf pair during a reference measurement. DAVID can be used independent of the IMRT method (Step & Shoot, Sliding Window or Dynamic Arc).
Chamber
The DAVID measurement chamber is a transparent, segmented, multiwire ionization chamber (MIC). Measurement wires are stretched parallel in the chamber. Each chamber wire measures the dose resulting from the opening of a leaf pair.
The chamber is inserted into the accessory tray of the accelerator. A battery supplies power to the measurement system. The battery offers an operating time of at least 16 hours when used continuously. It is replaced without installation work daily and charged in a separate charging station.
The measurement signals are transmitted using a Bluetooth radio link to a receiver installed in the radiotherapy room. The receiver is connected to a PC outside the radiotherapy room via RS 232. A special data buffer system intercepts brief radio signal interruptions.
Installation
The DAVID chamber is inserted into the accessory tray of the accelerator. The chamber can simply be removed for electron radiation. No cable connection is required thanks to battery operation and Bluetooth data transmission.
Software
DAVID software is easy to use. The logical, workflow-ori-ented structure only requires short familiarization times. Use of the software is reduced to selecting the patient and starting the measurement. The measurement values, evaluation and documentation are done automatically. An overview of each fraction can be printed for complete documentation.
The DAVID system was developed in collaboration with PIUS Hospital and CARL VON OSSIETZKY University, Oldenburg as well as Goettingen University, Germany.
Parts
L981411 DAVID system, Elekta MLCi 80
L981410 DAVID system, Siemens MLC 58, MLC 82
L981412 DAVID system, Varian MLC 52, MLC 80
L981413 DAVID system, Varian MLC 120
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