Introduction to Image Pattern Recognition

INTRODUCTION TO IMAGE PATTERN RECOGNITION

LEARNING OBJECTIVES

At the end of sessions in image pattern recognition students should be able to ;

Apply radiological pathology concepts in recognizing abnormalities of axial and appendicular system patterns Apply systematic chest analysis in identifying chest abnormalities Apply radiological pathology pattern recognition technique in identifying abnormalities in GIT contrast image Apply image pattern recognition approach in evaluating abnormalities of the Genital urinary system contrast investigations Apply image pattern recognition steps in identifying abnormalities in dental radiographs Apply image pattern recognition steps in documenting radiological image

Introduction

Pattern recognition may be defined as being able to recognise normal anatomical and physiological appearances on an image and those variations of appearances, which may indicate pathology.

Some criteria should be met, to be competent in pattern recognition.

A person who performs pattern recognition should have a fair amount of expertise in medical imaging and knowledge of radiographic anatomy and normal variants so as to identify variations that may indicate pathology.

Introduction to Image Pattern Recognition

Optimal image quality allows one to make accurate diagnosis Unacceptable images may cause one to miss a fracture or a destructive lesion.

NOTE: It would be difficult to confidently perform pattern recognition if the image quality of a dynamic image or hard copy is not of an acceptable standard.

There is consensus that optimal image quality entails meeting medico-legal requirements, such as each image to contain the patient's details, date of examination, anatomical marker, and adequate visualisation of radiographic anatomy /signs.This means that patient positioning should be correct for each projection, that the images are not blurred and that optimal image density is visualised.

Introduction to Image Pattern Recognition

Thus Image quality depends on correct radiographic techniques being used for each projection, correct selection of exposure factors and use of suitable imaging systems which are of an optimal standard.

The patient/area of interest should be in accordance with recommended projections to ensure that all relevant anatomical parts are visualized.

For example in skull radiography the patient's head should be straight to allow one to comment of symmetry of the skull bones, Chest radiographers should always be exposed on full inspiration to prevent incorrect diagnosis due to unacceptable radiography

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