List of top Biomedical Engineering Questions on Medical Imaging Systems

Among the piezoelectric materials, PZT crystals show better electro-mechanical conversion efficiency than Quartz crystals upto a frequency of about:

In an ultrasonic transducer with radius \( R \) and ultrasound wavelength \( \lambda \), the near field extends to a distance given by:

Acoustic impedance of a medium is defined as the product of:

In an image intensifier, the factors contributing to brightness gain are:

With reference to Ultrasonography, the correct order of the materials/tissues with ascending values for the half value layer is:

The atomic number of the anode material in an X-ray tube is \( Z \). If the X-ray tube has an anode-to-cathode voltage of \( V \), the efficiency of X-ray production is proportional to:

SPECT systems are not suitable for dynamic studies because:

CT imaging reconstructs cross-sectional images primarily using:

In MRI system, longitudinal relaxation time is slower than:

In a PET scanner, the positron combines with:

Cardiac images obtained with conventional CT may not be precise due to:

High efficiency in CT detectors results in: