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Medical technology has come a long way. It seems new machines and instruments are available every day to test us and fix us. From tiny nanobiosensors to large robotic surgical arms, to chemical and genetic technology that personalizes medicine and its delivery ... There are so many new developments that it's impossible for us to know about them all.
But some technology has been in regular use for a long time, and is still used every day. In particular, diagnostic machines and instruments have names that are familiar: x-rays, CT scans, ultrasound, MRIs and PET scans. These are the machines used to test us for many different types of conditions and diseases.
As empowered patients, it's good for us to know what the differences are among these machines, and why our doctors might choose to use one instead of the other to diagnose us.
X-Ray Machines: The first x-ray machine was invented in the late 1800s and is still one of the best diagnostic tools available. It is used for viewing skeletal systems, lungs, blood vessels or intestines. X-rays are quick and painless and produce a negative photograph for the doctor to study.
CT Scanner: Often pronounced "cat scan," CT is the abbreviation for "computerized tomography." That means it combines x-rays with mathematical algorithms to produce three-dimensional pictures of one’s spine, blood vessels, or muscles. CT Scans are also used to identify tumors. The scan itself is painless, and its duration depends on what is being studied.
Ultrasound: If you’ve been pregnant then you’re probably familiar with ultrasound. Sound waves are sent into the body, and changes in the reflection of the sound, called the Doppler effect, produce images which can be viewed on a monitor. Ultrasound is painless and very safe. Besides pregnancy, it is also used to track blood flow through veins and arteries, or may even be used to determine whether you have appendicitis.
MRI: Magnetic resonance imagining makes use of a huge magnet combined with radio waves to examine the internal body and produce incredibly detailed images in either two or three dimensions.