Image Characteristics and Quality Factors

Learning Objectives

References and Resources

Mind Map Summary


Learning Objectives

1. Identify the five basic characteristics of an image that determine its quality. 
2. Describe generally how each characteristic affects visibility of anatomical structures and signs of pathology. 
3. While looking at a chest radiograph, explain the concept of object and area contrast. 
4. While looking at a chest radiograph, identify areas in which object contrast appears to be reduced because the areas are either too light or too dark. 
5. Explain the concept of contrast sensitivity and it's significance in medical imaging.. 
6. Compare the contrast sensitivity characteristics of radiography and MRI for visualization of soft tissue. 
7. Identify the radiographic procedure that requires the highest contrast sensitivity and explain why. 
    NOTE: In later modules you will learn the factors in each imaging modality that have an effect on
contrast sensitivity. 

8. While looking at radiographs, identify some of the objects that represent anatomical detail, estimate their sizes. 
9  Describe the basic relationship between image blurring and visibility of detail. 
10. Compare and rank the various medical imaging modalities with respect to visibility of detail  (blurring). 
NOTE: In later modules you will learn the factors in each imaging modality that have an effect on
blurring and visibility of detail. 

11. Describe the appearance of image noise. 
12. While looking at images from each modality identify the image noise, Identify the modalities that appear to produce images with relatively low noise, with relatively high noise.. 
13. Describe the effect of noise on visibility of objects within an image and identify the object characteristic that makes it have reduced visibility in the presence of noise. 
NOTE: In later modules you will learn the factors in each imaging modality that produce and have
an effect on the noise. 

14. Define image artifact. 
15. Recognize common image artifacts in images from each modality. 
NOTE: In later modules you will learn the factors in each imaging modality that produce and have
an effect on artifacts 

16. Identify and describe three possible types of medical image distortion. 
17. Identify and describe three major viewing condition factors that have an effect on the visibility of objects within a medical image.

18. Describe the factors that produce optimum viewing conditions for medical images. 
19. Describe the special viewing conditions required in mammography and explain how they are achieved. 
20. Interpret the general results of a receiver operating characteristic (ROC) analysis. 


References and Resources

1.  Chapter 1. The Physical Principles of Medical Imaging, 2ndEd. Perry Sprawls.  Medical Physics Publishing.

Resources on the Web

 

 


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