<prompt> Which of the following investigation work on the same principle?CT and MRICT and X-rayUSG and HIDA ScanMRI and PET Scan  <response>: Principle of: CT :Linear attenuation ofXrays Xray:Xrays Fluoroscopy also works on the principal of Xrays MRI: Gyromagnetic propey of H USG: Pulse-Echo Principle with Piezoelectric effect PET scan: Annihilation and coincidence imagine, gamma rays -511 key HIDA Scan: Radioisotope scintigraphy, gamma rays. 