Embed image in html email

1. Interface upload image 

2. second interface use document viewer to display image. Pulling image by document ID 

a!documentViewerField(
label: "Laboratory test results image",
document: ri!svcRequest.lab_images,
altText: "5 Digital Transformation Predictions for 2018 and Beyond",
height: "MEDIUM"
)

3. What I need is to pull the same image and display in an email. How would I go able doing so? What I am seeing is that is may not be possible. 

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