Having a slice(medical image), how can i find out the radii and area of sphere using region props

I have a slice and it contains center points of 4 spheres...The spheres are of different radii.. how can i find the radii and area of each sphere?

[Image Analyst]

Depends on the format. Maybe you can use dicomread(). But somehow you need to get a reader for your data files. I don't have one.

Answer 1

[Image Analyst]

This is done in my image Segmentation Tutorial with coins. http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

Just ask regionprops to get the area and 'EquivDiameter'

measurements = regionprops(CC, 'Area', 'EquivDiameter');

[MoonPie1]

As it is slices of images, i am unable to read the slice as it is not in png or tif format.. Is there any way i can read only required slice?

[MoonPie1]

1. Please let me know how to read one image slice from a set of slices.
2. Please post the code to find the radius, area of the sphere and threshold it with respect to background

[Image Analyst]

1. How can I know the format of your images? That is needed before you, me, or anyone can recommend, or write, a "reader" for your image data. As far as I know, imread() should work. Prove me wrong.
2. The tutorial code was posted in the link I gave. Not sure why you're not able to access the File Exchange. Maybe try later. In the meantime, I've attached it here.

[MoonPie1]

1. How to sustain required elements and delete unnecessary elements from an array? 2. I have 4 values of connected components, how to display them as an image?

[Image Analyst]

1. My demo shows you how to select certain blobs based on some criteria like area. Did you see that code?
2. I'm not sure what you're asking. What is "4 values of connected components". I show you how to get the connected components, labeled image and display it in both grayscale and with different colors for each individual blob. What do you want and why isn't my code doing it?