I would like to thanks Dr. Arum K. Saraf and Donald Sluter.

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My original question was:

Hi ArcViewrs,

Someone knows an extension or an avenue script to
extract an Image Data Source by an polygon (this polygon
can be an basin, or a circle, rectangle...)

Thanks I will sum

Valeria Prisco
e-mail: valeria@geoambiente.com.br
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Dr. Arum K. Saraf: I know a indirect method using Spatial Analyst and Grid
Analyst (an extension developed by me, available on ESRI Script page) which
shall extract image using a polygon as desired by you. If you see Manual
associated with Grid Analyst, you will find a step-by-step approach to
achieve the above objective. Please use it and acknowledge. Further, if you
learn some direct method, please let me know.

Donald Sluter: Try Image.Snap2CellExtract from ESRI's web Page:
http://gis.esri.com/arcscripts/details.cfm?CFGRIDKEY=1939879989