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Study Syllabus for Classification of Radiographs of Pneumoconioses						Print
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										Radiograph ClassificationSubset 1Section 2: Parenchymal Abnormalities (Continued)
Radiograph #1
Demonstrates the difference in appearance between small rounded and small irregular opacities.
Radiograph 1p demonstrates excellent examples of p opacities between the left 2nd and 3rd anterior interspaces. Radiographs 1q and 1r show good examples of those opacity types respectively.
Radiograph 1s shows good examples of s opacities
Radiograph 1t the right lower zone shows good examples of t opacities.
Radiograph 1u is the ILO analog standard for u opacities. Chest radiographs with u opacities are very rarely seen.
With respect to size, small rounded opacities are defined in terms of their diameters:
p = up to about 1.5 mm
q = diameters exceed 1.5 mm and up to about 3 mm
r = diameters exceed 3 mm and up to about 10 mm
The sizes of small irregular opacities are expressed in terms of their widths:
s = up to about 1.5 mm
t = widths exceed 1.5 mm and up to about 3 mm
u = widths exceed 3 mm and up to about 10 mm
Radiograph #2
Presents a normal study, but then illustrates the differences in diameter that characterize small rounded (p, q, r) opacities.
Radiograph #3
Illustrates the differences in width that characterize small irregular (**s, t, u**) opacities.
Because u opacities are rare, radiograph 3u uses the current analog ILO standard as an example.
Note that the classification form has two sections for recording the size and shape of small opacities: primary and secondary. Determine the size and shape of any small opacities that may be present by comparing the subject radiograph with ILO Digital Standard Radiographs, which take precedence over written definitions. In the **primary** block, check the letter that refers to the size and shape of small opacities that predominate. If small opacities of some other size and shape are also present in significant numbers, check the letter that refers to the next most numerous type of opacity in the **secondary** block. If virtually all small opacities are of the same size and shape, check the same letter in both the **primary** and **secondary** blocks.PARENCHYMAL ABNORMALITIES, INTRODUCTIONPage 2 of 8RADIOGRAPHS #4 TO #10
							
					
							Last Reviewed:  April 26, 2023						Source: 	National Institute for Occupational Safety and Health
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        Syndicate homeStudy Syllabus for Classification of Radiographs of Pneumoconioses
Introductionplus icon
Preface
Appreciation to Contributors
Intent of the Self-study Syllbus
Getting Started
Clinical Overviewplus icon
Major Occupational Lung Diseasesplus icon
Pneumoconioses
Central Role of Diagnostic Imagingplus icon
Role of CT
Overview of Nonimaging Clinical Tools in Lung Disease Diagnosis
Appendix A
References
Pathology Overviewplus icon
Pulmonary Silicosis
Coal Workers’ Pneumoconiosis
Asbestos Pleuropulmonary Disease
Pathological-Clinical Correlations
References
Radiograph Classificationplus icon
SUBSET 1 – Radiograph Classification, #1 to #19plus icon
Introduction
Radiograph Identification
Section 1: Image Quality
Section 2: Parenchymal Abnormalities, #1 to #14
Section 3: Pleural Abnormalities, #15 to #19
Section 4: Any Other Abnormalities
Section 5
SUBSET 2 – Radiograph #20 to #27plus icon
Radiograph #20
Radiograph #21
Radiograph #22
Radiograph #23
Radiograph #24
Radiographs #25 to #27
SUBSET 3 – Radiograph #28 to #38plus icon
Radiographs #28 to #30
Radiographs #31 to #32
Radiographs #33 to #35
Radiographs #36 to #38
SUBSET 4 – Radiograph #39 to #46 (Small and Large Opacities)plus icon
Radiographs #39 to #40
Radiographs #41 to #42
Radiographs #43 to #44
Radiograph #45
Radiograph #46
SUBSET 5 – Classifications and Answer Keys, Radiographs #47 to #83
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