To study the fluoroscopy

Engr Khaleeque Ahmed

Sir syed university of engineering & technology Karachi

Fluoroscopy

•Fluoroscopy is a type of medical imaging that shows a real time X-ray image on a monitor, much like an X-ray movie. During a fluoroscopy procedure, an X-ray beam is passed through the body. The image is transmitted to a monitor so the movement of a body part can be seen in detail.

image intensifier

•The image-intensifier tube is a complex electronic device that receives the image-forming x-ray beam and converts it into a visible-light image of high intensity.

•The input phosphor converts the x-ray photons to light photons, which are then converted to photoelectrons within the photocathode

image intensifier

•Through this process, several thousand light photons are produced for each x-ray photon reaching the input phosphor. Most modern image intensifiers use cesium iodide for the input phosphor because it has a high absorption efficiency and thus decreases patient dose.

image-intensifier tube

• The image-intensifier tube is approximately 50 cm long. A potential difference of about 25,000 V is maintained across the tube between photocathode and anode so that electrons produced by photoemission will be accelerated to the anode

photocathode

•The photocathode emits electrons when illuminated by the input phosphor.

•This process is known as photoemission.

Advantage of Image intensifier

•The principal advantage of image-intensified fluoroscopy over earlier types of fluoroscopy is increased image brightness. this requires high levels of image brightness.

•The image intensifier was developed principally to replace the conventional fluorescent screen, which had to be viewed in a darkened room and then only after 15 minutes of dark adaptation.

Types of Image Intensifier

FIXED

• Fixed…may be mounted no closer than 15 inches or 38 cm to patient

MOBILE

•Mobile may be brought no closer than 12 inches or 30 cm to patient

FLUOROSCOPIC DATA AQUSITION-IMAGE INTENSIFIED SYSTEM

1. X-RAY TUBE2. PATIENT3. IMAGE INTENSIFIER4. OUTPUT PHOSPHOR5. CAMERA6. MONITOR

Applications

•Fluoroscopy is used in many types of examinations and procedures such as

• cardiac catheterization

•orthography (visualization of a joint or joints)

• lumbar puncture,

•placement of intravenous (IV) catheters (hollow tubes inserted into veins or arteries)

Thank you………….!!!!