Which of the following statement is false about magnetic res

Which of the following statement is false about magnetic resonance imaging? the MRI signal represents a lime- and position-dependent magnetization function, where position dependency is based on the addition of magnetic field gradients and phase differences to the basic magnetic Held B. T_1 or spin-lattice relaxation, describes the recovery of a spin to its equilibrium magnetization along the z-axis. while T_2. or spin-spin relaxation, describes the gradual deplaning of any component of the magnetization in the x y -plane, towards random phase that equates with a null transverse component. the Spin-Echo pulse sequence is based on a 90-dcgrcc flip angle soon followed by a 180- degree flip angle that reverses the effect of magnetic in homogeneity and causes the portion in the xy -plane of the magnetization to briefly rephrase. Frequency encoding has no effect on the Lamar frequency of spins. None of these statements is false. Which is true of the Gaussian function? One way of computing the derivative of noisy signal is (o smooth with a Gaussian before taking the derivative. Now. because differentiation and convolution are both linear operators we can invert their order and thereby compute the derivative of the smoothed signal by simply convolving the raw signal with the derivative of a Gaussian. Gaussian filtering in 2D can be decomposed into two II) Gaussian filtering operations. Convolution of a signal with a Gaussian filter in the spatial domain equates with multiplication of the Fourier transform of (he signal with the Fourier transform of the Gaussian (which is a Gaussian also) in k-space. A Gaussian filter acts as a low-pass filter, c. AH of the above arc true.

Solution

3) In the above question Part D that is Frequency encoding has no effect on the Larmor Frequency of spins if false.

The spinning protons wobble or “precess” about that axis of the external Bø field at the precessional,Larmor or resonance frequency.

Magnetic resonance imaging frequency

= Bo

where is the gyromagnetic ratio

The resonance frequency of a spin is proportional to the magnetic field, Bo.

4) For this question , all the above the above is true.

In 1D signal processing Gaussian filter acts as the low pass filter.

It can also decompose 2D Gaussian filtering into 2 1D Gaussian filtering operations