List of top Medical Imaging Systems Questions asked in GATE BM

The plot of \( \log_{10} ({BMR}) \) as a function of \( \log_{10} (M) \) is a straight line with slope 0.75, where \( M \) is the mass of the person and BMR is the Basal Metabolic Rate. If a child with \( M = 10 \, {kg} \) has a BMR = 600 kcal/day, the BMR for an adult with \( M = 100 \, {kg} \) is _______ kcal/day. (rounded off to the nearest integer)

Which of the following statement(s) about ultrasound waves is/are true?

Which one of the following does NOT use piezoelectric transducers?

Which one of the following statements is CORRECT for any second order linear system with Proportional Integral Derivative (PID) controller?

The closed loop system shown below _______.

\[ G(s) = \frac{25}{s(s + 5)} \]

Consider the following statements:
Assertion: Positron Emission Tomography (PET) uses radionuclides, such as 11C and 15N, to study tissue metabolism.
Reason: Positron-emitting nuclides are incorporated in molecules that are essential for metabolism.

Given the following statements, which one of the options is correct?
Statement (i): Structural Magnetic Resonance Imaging (sMRI) has better spatial resolution than Electroencephalogram (EEG)
Statement (ii): EEG has better temporal resolution than sMRI

Newton Raphson method is used to solve the equation \(x^3 - 2x - 5 = 0\) with an initial guess \(x_0 = 3\). What is \(x_1\), the value after ONE iteration?

An X-ray beam of initial intensity I₀ of 70 keV imaging the chest is assumed to undergo attenuation through the muscle tissue for a thickness of 16 cm and further through the bone tissue for a thickness of 4 cm. The half value layer (HVL) thicknesses for the muscle and bone are 3.5 cm and 1.8 cm, respectively. The percentage of X-ray intensity transmitted through the body is ________.
Give your answer rounded off to 2 decimal places.

If a circular ultrasound transducer of radius a = 8 mm operating at a central frequency of 1 MHz has a pressure beam pattern in a medium as given below :
\(P(r,0) \propto\sin\frac{ka^2}{4r}\)
Here, k is the wave number, r is the axial distance from the center of aperture. The speed of sound in the medium is 1600 ms^-1.
The reduction in intensity between r = 8 cm and r = 16 cm is _______ dB. Give your answer as a positive quantity rounded off to two decimal places.

The X-ray attenuation coefficients as a function of photon energy for three materials are shown in the figure below. A tissue phantom containing these three materials is imaged at two different X-ray photon energies of 50 keV and 150 keV. When the developed X-ray film is viewed, which of the following statements is/are TRUE ?

A Doppler ultrasound transducer operating at 5 MHz gave maximum output frequency shift of 3 kHz. The velocity of sound in blood is 1500 m/s. If the probe was held at an angle of 45° to the direction of blood flow, the maximum velocity of blood flow through the artery is _______ m/s. (Give your answer rounded off to two decimal places.)

Which one of the following events is NOT typically encountered in diagnostic X-ray projection radiography ?