Dear Sandip,

please:   not all interested colleagues are familiar with abbreviations set as being known, especially if such abbreviations might be plurivalent....

in your case here I guess NHP stands for "posterior hypothalamic nucleus"

(e.g. http://www.pnas.org/content/72/10/4177.full.pdf )    or did you mean:

NonHumanPrimates?, 

Neurohypophysis,

(cf. https://www.allacronyms.com/_medical/NHP/1 )   ;-;)

Finally: are you talking about Digital Imaging techniques (any kind) or rather 'histo'-morphology / 'histo'morphometry?

Thank you for decribing a bit mor in detail you want to do. Best wishes and regards, WM