Right Approach to Radiation Dose Management
Safety First for Patients and Staff
Our top priority is to protect patients and staff from unnecessary radiation while achieving premium diagnostic image quality and thus optimal patient outcomes.
Our technology and applications allow healthcare providers to avoid over-exposure by effectively controlling patient entrance dose and dose exposure for medical staff.
Learn about our technology for avoiding over-exposure:
Advanced exposure control (AEC) interventional procedures
Advanced exposure control (AEC) is vital to keep image quality consistent for all examination types while automatically compensating for patient size. The Siemens AEC estimates the patient thickness in real time. Variations in patient size, anatomical area, and C-arm angulation are automatically considered when calculating the needed dose. Based on this measurement, the detector entrance dose is kept constant due to an automatic and real-time adjustment of the following five parameters: tube current, focal spot, pre-filter, exposure time, and tube voltage.
Multilevel Patient Entrance Dose Warning
CAREguard provides an effective way to control patient entrance dose (i.e. air kerma at the patient entrance reference point PERP1). Three dose threshold values (low, medium, and high) can be individually defined. If the accumulated patient entrance dose exceeds one of the defined thresholds:
- An audible warning sound is given
- A patient entrance dose indicator on the live display flashes
- A warning popup is displayed on the ECC/touch screen
Dose Notification and Dose Alert in Computer Tomography
Dose Alert is a dose warning tool with Dose Notification values for CTDIvol and DLP can be defined that should not be exceeded.
With Dose Notification values for CTDIvol and DLP can be defined that should not be exceeded. This has to be done separately for CT examinations in adults and children. National organizations such as BfS (Bundesamt für Strahlenschutz, Federal Office for Radiation Protection, Germany) and ACR (American College of Radiology, USA) provide recommendations1 on reference dose levels in terms of CTDIvol and DLP. If the planned setting for the exam would result in a CTDIvol or DLP higher than these predefined values for one scan a Dose notification message box will inform the user.
Dose Alert is another dose warning tool. Here the CTDIvol values are predefined for both, CT examinations of adults and children, when the system is shipped. According to recommendations by FDA (Food and Drug Administration, USA) these two values are set to 1000 mGy. These predefined values can be changed. In addition the definition of a DLP value is possible. A Dose Alert message box is displayed if the accumulated CTDIvol or the accumulated DLP, plus the estimated values for the next confirmed scan range, exceeds the corresponding Alert Value. A diagnostic reason and the user’s name have to be entered before the scan can be performed with these settings. In many countries functionalities like Dose Notification and Dose Alert will become mandatory in the near future.
Automatic Exposure Control (AEC) in Mammography
The adaptive AEC modus reads out the complete area of the detector that is covered by the breast. The system searches the densest part of the breast tissue and selects the lowest possible exposure parameters based on the individual breast size and composition.