dot lasso selection

 From:  matur61
7135.1 
hi,
I have a problem (hoping a smaal one) and is the following :

sometimes I have surfaces like the one attached (see lasso selection.jpg) and I'd like to select some dots (i.e. the ones in the image).

Is it possible to do it in a "lasso" mode?. Just to be clear like the tool you have in photoshop to select an area.

In this moment I have to select it one by one.

thanks for any help
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