12th Zoology

Computed Tomography CT

Computed Tomography (CT)(OR) Computerized axial tomography (CAT).

The imaging technology or machine vision has revolutionized the
medical world. It enables the doctors to watch vital organs, identify
blockages and growths and diagnose signs of diseases without doing

Computed tomography scan or (CT) scan :

Computed Tomography (CT) or “CAT scanning” combines the use
of a digital computer together with a rotating X-ray device to create detailed
cross sectional images or “slices’ of the different organs.

Advantages of Computed Tomography CT over other imaging techniques

Among the various imaging techniques CT has the unique ability to
image a combination of soft tissue, bone, and blood vessels. For example,
conventional x-ray image of the head can only show the dense bone
structures of the skull. X-ray angiography of the head depicts only the head
and neck and not the soft brain-tissue. Magnetic resonance (MR) imaging
does an excellent job of showing soft tissue and blood vessels, but MRdoes
not give as much details of bony structures such as the skull.CT images of
the head allow physicians to see soft-tissues, anatomic structures like the
brain’s ventricles, of grey and white matter. CT can provide detailed cross
sectional images and diagnostc information for nearly every part of
the body.

Uses of CT Computed Tomography

1. CT is an invaluable tool in the cancer diagnosis process and is often the
preferred method for diagnosing lung, liver and pancreas cancer.
2. CT imaging and CT angiography are finding a greater role in the detection,
diagnosis and treatment of heart disease, acute stroke and vascular diseases,
which can lead to stroke, gangrene or kidney failure.
3. CT can be used to measure bone mineral density for the detection of

4. CT has excellent application in trauma cases and other internal bleeding in
5.CT is used extensively for diagnosing problems of the inner ears and
sinuses. The anatomy of the inner ear and sinuses is made up of delicate soft
tissue structures and very fine bones. CT is excellent for imaging tumors or
polyps in the sinuses and disease that cause degeneration of the small bones
in the inner ear.
6. CT has been the basis for interventional work like CT guided biopsy and
minimally invasive therapy. CT images are also used as basis for planning
radiotherapy cancer treatment. CT is also often used to follow the course of
cancer treatment to determine how the tumor is responding to treatment.

Related Topics in Zoology:

Bio Zoology All Important Topics

  1. Livestock and Management

  2. Important cattle breeds and their characteristics

  3. Milch breeds (or) Dairy breeds

  4. Dual purpose breeds & Draught breeds

  5. Exotic breeds of cattle

  6. Common diseases and control in Cattle – Contagious diseases

  7. Non-contagious diseases – Cattle

  8. Techniques adopted in cattle breeding

  9. Poultry Breeds

  10. Farming methods

  11. Poultry byproducts

  12. Fish Pond

  13. Edible Fishes Of Tamilnadu

  14. Medical Lab Techniques – Stethoscope

  15. Sphygmomanometer

  16. Haemocytometer

  17. Urine Sugar analysis

  18. ECG Electrocardiogram

  19. Computed Tomography CT

  20. Endoscopy (Laproscopy) techniques , Artificial Pacemaker

  21. Autoanalyser

Unit 7. THEORIES OF EVOLUTION Topic List Zoology

  1. Theories Of Evolution Introduction

  2. Lamarck Laws

  3. Neo Lamarckism

  4. Darwinism

  5. Theory of Natural Selection

  6. Objections to Darwinism

  7. Modern concept of Natural Selection

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