Which of the following is a contrast X-ray technique?*magnetoencephalographyangiographystructural magnetic resonance imagingpositron emission tomographyfunctional MRI

In which of these radiological examinations ionizing radiation is used?Question 33Select one:Digital subtraction angiographyUltrasoundMagnetic resonance imaging

use of contrast dya in visualization using x-ray

Which radiological examination plays leading role in the differential diagnosis of peripheral lung cancer and benign tumor/structure?Question 20Select one:X-raysComputed tomographyMagnetic resonance imaging

Tomography is imaging by sections. By aquiring multiple 2-D images from multiple , a 3-D image may be reconstructed with the aid of a tomographic reconstruction applied by a computer. The device used to produce the images is called a tomograph, while the image produced is a tomogram. Several different tomographic methods are used in modern medicine for purposes. Of particular interest to us are techniques which use radionuclides. In SPECT ( photon computed tomography), the patient is injected with a that decays by gamma-ray emission. These gamma rays are detected by a camera, forming an image of the distribution of the in the body of the patient. Another tomographic method that uses radionuclides is PET ( emission ). In this method, the radionuclide which is injected decays by (positive beta-particle) emission. It does not take long for the positron to collide with an , anihiliating each other, producing two that travel off in (generally) opposite directions. These of gamma-rays are then detected by the PET scanner.

Which imaging modality is used for bone densitometry?Question 21Select one:a.CT scanb.DEXA scanc.Ultrasoundd.MRI