CODEWITHSUNDEEP
dicom
user180545
user180545

Reputation:

Convert Pixels to mm/cm from DICOM Tags (Ultrasound)

I am working on a custom PACS solution and I need to implement a measurement tool for multi-frame ultrasounds (each study has multiple motion and still-frame components). I have done this for X-rays using the "Pixel Spacing" tag, but that is not present in the ultrasound. How can I calculate the distance between two points using the data provided in the DICOM tags?

Upvotes: 2

Views: 3788

Answers (2)

Naveen
Naveen

Reputation: 73443

You need to take a look at the US Region Calibration Module in Part 3 of the DICOM standard. That will tell you how the images are captured and how to translate the stored pixel values into the real-world pixel values. Remember that US image consists of multiple regions with each region representing a different entity.

Upvotes: 2

Broam
Broam

Reputation: 4648

You're going to need some sense of scale, possibly derived from the frequency/wavelength the probe is using. This may also depend on the type of probe used, which should be in the data somewhere.

(My father and brother are ultrasound techs; I'm the programmer. I'd have to ask for details in to how they'd read an ultrasound data set and find out the scale.)

Upvotes: -1

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