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Radiology Study of radiation of radioactive substances.

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Presentation on theme: "Radiology Study of radiation of radioactive substances."— Presentation transcript:

1 Radiology Study of radiation of radioactive substances

2 Radiology Is the study of diagnosis of disease using radiant energy (radiation)

3 What is radiation Radiation is energy in the form of electromagnetic waves Ultraviolet Light, gamma rays, heat and sound are types of radiation. ionizing radiation is used in Xrays it changes electrical charge of atoms & may have an effect on body cells A radioisotope is a substance that can emit radiant energy

4 Word Parts Word rootCombining form Meaning Radiradi/oinvasive X-rays by an X-ray machine Roentgenroentgen /oX-rays TomTom/oslice or section Sonson/osound Echoecho-reflection of sound ThermTherm/oheat Scintscint/oemitting sparks /light Cinecine,cinemat/omoving film

5 Radiology Is a branch of medicine dealing with radioactive substances Used to diagnose and treat diseases using radiant energy Diagnostic Therapeutic Nuclear medicine

6 Diagnostic radiology Is imaging using external sources of radiation e.g. X-rays

7 Radiography (X ray) Small amount of radiation is passed through the body to create a film of picture. The image is called a radiograph / radiogram X-rays are taken by a radiographer X-rays are interpreted by a radiologist

8 Radiograph (X-ray) Some body parts block the X-rays and are said to be radio-opaque They appear white on the films e.g. bones Other body parts don’t show up on x-ray or aren’t radio-opaque e.g. GIT Radio-opaque substances or contrast medium are given GIT show on film

9 Computed Tomography (CT Scan) Combines principles of X-rays and computer technologies A machine called a scanner takes a series of X-rays of body cross sections i.e. (tomographic) Machine rotates a full circle over the body part being scanned A computer then calculates and converts the rate of absorption and density of the X-rays into a three dimensional picture on a TV screen

10 Computed Tomography (CT Scan) Can differentiate different body parts that cannot be done through conventional X-rays Is painless

11 Magnetic Resonance Imaging (MRI) Uses magnetic fields and radiofrequency waves no ionising radiation Patient is positioned within a magnetic field as radio waves are conducted through the body part. Energy is absorbed through the body part then released. Computer processes the released energy and produces the picture

12 Therapeutic Radiology Treatment of disease using radiation e. radiotherapy Uses superficial and deep x-ray machines or radioisotopes e.g. radioiodine Used to treat malignant neoplasms and

13 Positron Emission Tomography Provides information about activity of different body parts Ring of detectors surround the patient Patient receives injection of a Positron radioactive material called a tracer. PET Scanner has a camera that detects emissions from the tracer and the computer creates two and three dimensional images Areas that are more active in taking up the tracer appear brighter than normal tissue

14 Sonography / Ultrasound Use of high frequency sound wave to visualise body parts Ultrasound waves are sent through a scanning device known as a transducer These waves are then reflected of body structures and converted into images

15 Use of contrast Some imaging procedures require use of contrast medium to more easily visualise body structures Includes Barium, iodinated compounds and gases Maybe injected, swallowed or introduced through an enema or catheter Act 1


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