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Sergey - 
Quantitative DIC has been described in 

Kou et al. "Transport-of-intensity approach to differential interference contrast (TI-DIC) microscopy for quantitative phase imaging." Optics letters 35.3 (2010): 447-449.

For quantitative brightfield also look for "transport of intensity".

There is also a method called "defocusing microscopy", I don't know much about it.

Mike

-----Original Message-----
From: Confocal Microscopy List [mailto:[log in to unmask]] On Behalf Of Sergey Tauger
Sent: Wednesday, March 26, 2014 10:45 AM
To: [log in to unmask]
Subject: Re: Phase contrast microscopy

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Hi,

Mike, Phillippe, could you please share the article names of quantitative phase contrast, brightfield and DIC? I cannot find any articles neither that prove the methods are quantitative, nor PSF for the methods.

Best,
Sergey