Radiology is the study and use of imaging technology like X-rays and other radiation to diagnose and treat disease.
X-rays is the spectrum of electromagnetic energy used from energy produced by devices for the purpose of obtaining visual information (radiograph) as part of medical imaging. Radiology that involves use of X-rays is called roentgenology.
Radiographs are often used to look at bony structures and soft tissues. An X-ray machine directs rays upon a specified region in the body which tends to pass through less dense matter (air, fat, muscle, tissues), but is absorbed or scattered by denser materials (bones, tumours, lungs with growths).
• Plain X-ray imaging was the only method available for the first 50 years of Radiology and still used in evaluation of the lungs, heart and skeleton because of its wide availability, speed and relative low cost of operation.
• Fluoroscopy and Angiography are two specialties of X-ray imaging, where a fluorescent screen or image enhancer is connected to a CCT system permitting real-time imaging.
• Computed Tomography (CT) imaging utilises X-rays using computing algorithms to produce an image. Radiocontrast agents are often used with CT for greater contrast of anatomy.
• Teleradiology is the transmission of radiographic images from one location to another for interpretation by a radiologist. Good for emergency operations. Can access services in other time zones e.g. midnight in England is 10 in the morning in Australia thus allowing 24 hr service.