A physiological measuring module for the synchronisation of the ECG data with the CT scan

Introduction
For a new generation of CT scanners, a Physiological Measurement Module (PMM) was developed and manufactured for the synchronization of CT imaging with the respiratory or heart rate of the patient.

Task
During data acquisition with the CT scanner, the PMM has to record and analyse physiological data such as the ECG, pulse rate and a respiratory signal. A trigger signal has to be derived from the ECG data in real time, triggering the CT scan in a defined heart phase. The PMM has to be integrated into the foot of the scanner as a self-contained module. 

Results
Online ECG analysis was the key point. Therefore, the application of elaborate, complex analysis methods was out of the question. Nevertheless, the individual heart phases had to be reliably identified even in pathological cases. Thanks to its in-depth expertise in data analysis, seleon was able to develop a sophisticated ECG analysis procedure. Once the corresponding heart phase is identified based on the ECG data, the module sends a trigger signal to the CT scanner. This permits image capturing in the pause between two heartbeats, regardless of the heart rate or irregularities in the patient’s heartbeat. 

Advantages
Bundling all process steps from development to series production with one vendor and ongoing, transparent reporting to the customer led to the seamless integration of the module into the scanner. With an intelligent controller from the customer, adaptive dosage modulation controlled by the ECG was realised, minimising the radiation exposure in the fast heart movement phases.