types of imagine & uses
DESCRIPTION
Types of Imagine & Uses. Fluoroscopy. Technique for obtaining “live” X-ray images of a living patient What systems most commonly used for? Often used to observe the digestive track. Intravenous Pyelogram (IVP). Examination of the kidney, ureters and bladder - PowerPoint PPT PresentationTRANSCRIPT
TYPES OF IMAGINE & USES
Fluoroscopy Technique for obtaining
“live” X-ray images of a living patient
What systems most commonly used for?
Often used to observe the digestive track
Intravenous Pyelogram (IVP) Examination of the kidney, ureters and
bladder Uses a contrast material to enhance the
images Injected into the patients system;
progresses through the urinary track then recorded on a series of quickly captured images
Enables the radiologist to review the anatomy and the function of the KUB
IVP Machine Suspended above the table an apparatus
containing the x-ray tube Apparatus moves on a jointed “arm” so
that it can be properly positioned Radiologist can assess abnormalities as
well as how quickly and efficiently as the patients system is able to handle waste
Positron Emission Tomography (PET)
Diagnostic examination that involves the acquisition of physiologic images based on the detection
Heart: blood flow & heart disease, Decreased function.
Brain: evaluate memory disorders & causes, tumors, seizure disorders.
Ultrasound Or ultrasonography Medical imagine technique that uses
high frequency sound waves the their echoes
Similar to an echolocation used by bats, whales/dolphins & SONAR
In an Ultrasound, the following happen:
1. Ultrasound machine transmits high frequency sound pules into the body using a probe
2. Sound waves travel into your body and hit a boundary between tissues; fluid, soft tissue, & bone
3. Some of the sound waves get reflected back to the probe, while some travel further until they reach another boundary and get reflected
In an Ultrasound, the following happen:
4. Reflected waves are picked up by the probe and relayed to the machine5. The machine calculates the distance form the probe to the tissue or organ using the speed of sound in tissue and the time of each echo’s return 6. Machine then displays the distances and intensities of the echoes on the screen,
forming a two dimensional image
Ultrasound Machine Typical ultrasound, millions of pulses and echoes are sent
and received each second Probe can be moved to obtain various views
Transducer Probe: sends and receives the sound waves
Central Processing Unit: CPU, computer that does all the calculations; supplies electrical power to probe
Transducer Pulse Controls: changes the amplitude, frequency and duration of the pulses emitted from the probe
Display: displays image from the data in the CPU Keyboard: inputs data and takes measurements from
display
Different types of Ultrasounds Ultrasounds thus far display a two
dimensional image or “slice” of the three dimensional object
Two other types of ultrasounds are currently used: 3D Ultrasound Imagine & Doppler Ultrasound
3D Ultrasound In these machines, several two dimensional images
are acquired by moving the probes across the body surface or rotating inserted probes
The 2D scans are then combined by specialized computer software to form a #D image
Benefits? Better look at organ: early detection of tumors Visualizing a fetus to assess its development;
abnormalities in face and limbs Blood flow in organs or fetus Problems?
Doppler Ultrasound Measures the change in frequency of the
echoes to calculate how fast an object is moving
Used mostly to measure the rate of blood flow thorough the heart and arteries
Dangers? Concerns with safety as Ultrasound is energy Two major concerns:
- Development of Heart: tissue absorbs the energy which increases their temperature locally
- Formation of bubbles: when dissolved gases come out of solution due to local heat caused by ultrasound
No substantiated ill-effects of ultrasound documented