WHAT IS LINEAR TOMOGRAPHY

LINEAR TOMOGRAPHY IS ONE OF THE MOST BASIC TECHNIQUE AS THE TUBE AND FILM MOVE FROM THE FIRST POSITION TO THE SECOND,ALL POINTS IN THE FOCAL PLANE PROJECT TO THE SAME POSITION ON THE X-RAY FILM.POINTS ABOVE OR BELOW THE FOCAL PLANE DO NOT PROJECT TO THE SAME FILM POSITIONS AND ARE BLURRED.BY CHANGING THE RELATIVE MOTION OF THE FILM AND TUBE,THE FOCAL PLANE CAN BE ADJUSTED UPWARDS OR DOWNWARDS.

PURPOSE

THE PURPOSE OF LINEAR TOMOGRAPHY IS TO IMAGE ONLY THAT ANATOMY THAT LIES IN A PLANE OF INTEREST,WHILE BLURRING STRUCTURES ON EITHER SIDE OF THAT PLANE

EQUIPTMENT

EQUIPTMENT
EQUIPTMENT

LINEAR TOMOGRAPHY PRINCIPLES

THE X-RAY TUBE IS MOVED IN A STRAIGHT LINE IN ONE DIRECTION WHILE THE FILM MOVES IN THE OPPOSITE DIRECTION.AS THESE SHIFT OCCUR,THE X-RAY TUBE CONTINUES TO EMIT RADIATION SO THAT MOST STRUCTURES IN THE PART OF THE BODY UNDER EXAMINATION ARE BLURRED BY MOTION.

MOVEMENTS OF THE LINEAR TOMOGRAPHY MACHINES

MOVEMENTS OF THE LINEAR TOMOGRAPHY MACHINES

LINEAR OLD MACHINE NO LONGER IN USE

LINEAR OLD MACHINE NO LONGER IN USE
OLD TECHNOLOGY

LINEAR NEW TECHNOLOGY

LINEAR NEW TECHNOLOGY

LINEAR TOMOGRAPHY OBJECT PLANE

LINEAR TOMOGRAPHY OBJECT PLANE
ONLY OBJECTS LYING IN THE OBJECT PLANE ARE PROPERLY IMAGED.OBJECTS ABOVE AND BELOW THIS PLANE ARE BLURRED BECAUSE THEY ARE IMAGED ACROSS THE FILM.

THE MOTIONS OF THE LINEAR MACHINE

THE MOTIONS OF THE LINEAR MACHINE
MOVEMENTS

LINEAR MOVEMENT

LINEAR MOVEMENT

LINEAR MOVEMENTS

LINEAR MOVEMENTS

Wednesday, April 15, 2009

THE CHARGE -COUPLED DEVICE(CCD) FLUOROSCOPY




<span style="font-weight:bold;">TELEVISION CAMERA HAS TWO WAYS TO ELECTRONICALLY CONVERT THE VISIBLE IMAGE ON TO THE OUTPUT PHOSPHOR OF THE IMAGE INTENSIFIER INTO AN ELECTRONIC SIGNAL THE CHARGE-COUPLED DEVICE(CCD) IS ONE OF THEM.

Tuesday, March 31, 2009

Friday, March 27, 2009

radiographer with linear machine at work

linear movement



THE SIMPLEST TOMOGRAPHIC EXAMINATION IS LINEAR TOMOGRAPHY.DURING LINEAR TOMOGRAPHY THE X-RAY TUBE IS ATTACHED MECHANICALLY TO THE IMAGE RECEPTOR AND MOVES IN ONE DIRECTION,WHILE THE IMAGE RECEPTOR MOVES IN THE OPPOSITE DIRECTION.ITS PRINCIPLE ADVANTAGE IS IMPROVE CONTRAST RESOLUTION THROUGH BLURRING OF UNDERLYING AND OVERLYING TISSUES THE SUBJECT CONTRAST OF TISSUE OF THE TOMOGRAPHIC SECTION IS ENHANCED.

Friday, March 20, 2009

Linear Tomography



IN LINEAR TOMOGRAPHY THE ONLY OBJECTS LYING IN THE OBJECT PLANE ARE PROPERLY IMAGED.OBJECTS ABOVE AND BELOW THIS PLANE ARE BLURRED BECAUSE THEY ARE IMAGED ACROSS THE FILM

Thursday, March 19, 2009

linear motions


Linear tomography is one of the most basic technique as the tube and film more from the first position to the second,all points in the focal plane project to the same position on the x-ray film.
Points above or below the focal plane do not project to the same film positions and are blurred.By changing the relative motion of the film and tube, the focal plane can be adjusted upward or downward