Computed Tomographic (CT) scanning: It is a medical imaging technology employing tomography, were digital geometry processing is used to generate a three dimensional image of the internals of an object from a large series of two dimensional X ray images taken around a single axis of rotation.
Clinical significance:
1. Gives a clear image of bone, soft tissues and blood vessels.
2. - Helps in the diagnosis of injuries of the inner ears and sinuses.
3. To detect cancer, heart and lung disorders.
4. For diagnosis of spinal problems and skeletal injuries.
5. Helps to measure bone mineral density.
6. To detect stroke causing clots and hemorrhage in the brain.

1. Pacemaker is a medical device which uses electrical impulses, delivered by electrodes contracting the heart muscles, to regulate the beating of the heart.
2. The primary purpose of a pacemaker is to maintain an adequate heart rate, either because the heart's natural pacemaker is not fast enough, or because there is a block in the hearts electrical conducting system.

Normal RBC ranges are:
1. Male: 4.7 to 6.1 million cells per microliter
(cells/mcL ).
2. Female: 4.2 to 5.4 million cells / mcL. .
Normal WBC range: 4.5 to 11.0 x 109/ L

EEG - Electroencephalogram
1.EEG is a test to evaluate the electrical activitiesof the brain.
2. Brain cells communicate with each other through electrical impulses
3.EEG tracks and records the brain wave patterns.
4.It is a graphical recording of the electrical activities of the cortical and sub cortical regions of the brain.
5.It is recorded by placing the surface electrodes on the scalp region.
6.The electrodes analyse the electrical impulses in the brain and send signals to a computer which records the results.
7.In 1929 Germen scientist Hans Berger was the first to analyse the EEG. Hence, EEG is also known as "Berger Wave".
8.The electrical activity recorded by EEG may have synchronised or desynchronised waves. Has frequency waves! rhythms namely alpha, beta, delta and theta waves.

1. MRI does not utilize ionizing radiation.
2.MRI uses a powerful magnetic field, radio frequency pulses and a computer to produce detailed pictures of organs, soft tissues, bone and virtually all other internal body structures.
3..The radio frequency pulses re-align hydrogen atoms that naturally exist within the body while the patient is in the scanner without causing any chemical changes in the tissues.
4.As the hydrogen atoms return to their usual alignment, they emit different amounts of energy that vary according to the type of body tissue from which they come.
5.The MR scanner captures this energy and creates a picture of the tissues scanned based on this information.
6. The magnetic field is produced by passing an electric current through wire coils in most MRI units
7. Other coils, located in the machine and in some cases, are placed around the part of the body being imaged, send and receive radio waves, producing signals that are detected by the coils. The electric current does not come in contact with the patient.
8. A computer then processes the signals and generates a series of images, each of which shows a thin slice of the body.
9. The images can then be studied from different angles and interpreted by a radiologist.

Stethoscope is a medical device used to hear the internal sounds of the human body such as heart beat, sounds due to inhalation and exhalation of air in the lungs, stomach, intestinal movements and also foetal movements.
Clinical significance of stethoscope:
1. Stethoscope helps to find the normal and abnormal heart beat sounds and also to diagnose valve functions.
2. It helps to diagnose lung diseases such as pneumonia, pulmonary edema, bronchitis and pleuritis.
3. Stethoscopes along with sphygmomanometer are used to read the blood pressure.
4. It outlines the status of cardiac, respiratory and intestinal disorders.

Positron Emission Tomographic Scanning (PET):
1. PET is also computerized imaging technique unlike CT.
2. Positron emission tomography (PET) is a nuclear medicine procedure based on the measurement of positron emission from radiolabelled tracer molecules.

1. .Ultrasound waves are used to image the foetus at different stages of pregnancy to study the progress of the developing foetus.
2. They are used to hear foetal heart sound, blood flow, etc.
3. Used in echo cardiography to diagnose the damages in heart.
4. Used for diagnosis of tumours gall stones, kidney stones, obstructions in the genital tracts