The project concerning the design and supply of test stations for verifying the accuracy of ultrasound scanners, namely equipment for mapping and analysis of Point Spread Function, was carried out in collaboration with the Theoretical Institute of the Faculty of Medicine, Palacký University in Olomouc.
The measurement station consisted of a measurement bath, and an electronics and control PC cabinet. The PC contained the software for mapping, assessment and downloading of measured values and preparation of a report relating to the given measured ultrasound probe. Linear or convex ultrasound probes of any shape may be measured.
The primary component is the measurement bath containing liquid, namely demineralized water. An ultrasonic probe is attached to the bath’s side wall with the aid of universal locking fixtures. Inside the bath, a 0.5 to 2 mm diameter probe/reflector travels in three axes with the aid of stepper motors furnished with feedback. The reflector’s motion accuracy in all three axes is 0.1 mm. The ultrasonic measurement probe generates ultrasound waves and scans the reflected waves from the point reflector. An ultrasound scanner sends the dynamic image information to the analyser relating to the expected location of the reflector found by evaluation of the reflected ultrasound waves. Subsequently, the PC processes this information and compares it to the actual position of the reflector. The difference between the actual and measured position of the reflector is then assessed and processed by the PFS meter analysis software.