Aquí van algunos enlaces:
www.stat.berkeley.edu/~laan/ Research/Research_subpages/Papers/statsin.ps

You can also use "demarcated" or "determined" instead of delimited.

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Note added at 26 mins (2005-08-06 14:25:38 GMT)
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I think it\'s understood from the context that \"contours\" refers to the boundaries demarcating the organ/diseased portion to be treated.

Of course, you can rephrase at your convenience, but in this field of imaging the word for "contorno" is just "contour":

The CT bed is also automatically outlined for contouring accuracy. These features are just a few of the standard imaging capabilities that make...
http://www.rismed.com/systems/tps/index.asp

The algorithm traces the edges with detail providing high accuracy to the description of the contour shape. However, the final contour shape contains sharp edges giving an uncomfortable optical effect
www.maths.leeds.ac.uk/statistics/ workshop/lasr2004/Proceedings/zimeras.pdf

Try a Google search with "contour" and "contouring", you'll find many helpful examples.

Best regards,

Patricia

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Note added at 2005-08-06 21:25:47 (GMT)
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Robert, Muriel\'s comment may be relevant depending on the context. However, from your fragment I understand that this \"delimitación\" refers to defining the actual shape and size of the area to be irradiated (that is, previous procedures, before actual radiation).
On the other hand, the concept of \"sculpting\" refers to a specific technology, IMRT. As Muriel says, it\'s so specific that quotation marks are often used with the word \"sculpt\", but I\'d say that in Spanish the concept is rendered with a direct translation, \"esculpir\".

La descripción que mejor define el principio de la IMRT es su capacitad de \"esculpir el tumor\".

La IMRT, como el escultor, golpeando con diferente intensidad desde todas las direcciones, es capaz de reproducir tridimensionalmente cualquier forma.

Con esta tecnología, los haces de irradiación han dejado de ser largos y uniformes (con lo que inevitablemente irradiaban más del volumen deseado). La modulación de la intensidad de la irradiación permite que ésta se adapte al contorno exacto del tumor.
http://www.radioterapia-oncologia.com/castella/_private/IMRT...

Bombarding a tumor with deadly radiation without damaging nearby healthy cells has always been the Holy Grail in radiation cancer therapy. Mayo Clinic\'s physicians are a step closer to that goal with a new, exquisitely accurate but extremely complex treatment called Intensity Modulated Radiation Therapy (IMRT). IMRT combines the ability to take three-dimensional images of an organ with powerful computers and specialized software to precisely sculpt radiation treatment to the tumor.
http://www.mayoclinic.org/checkup-2003/july-imrt.html

HTH, best regards,

Patricia

...Sounds natural to me. Good luck.

"Contours" definitely. Also, "delimitacio'n" has a special meaning here, and that meaning needs to be captured. The term in English is "sculpt." It's such an unusual term that sometimes it's used in quotes.

**to "sculpt" the contours of a tumor**, sparing the adjacent healthy tissue. ... Standard radiation therapy affects both cancerous and normal surrounding ...
www.upmccancercenters.com/radonc/imrt.html

... very sophisticated computer hardware and software that enables radiation oncologists to "sculpt" the contours of the tumor with the radiation beams. ...
www.winthrop.org/newsroom/ publications/vol14_no3_2004/page1.cfm

... and intensity of the radiation beam and actually 'sculpt' the radiation to ... TomoTherapy combines intensity modulated radiation therapy (IMRT) with a ...
www.rcrh.org/Facilities/Centers/ CancerCare/Services/CCITomoTherapy.asp

Radiation Therapy, or IMRT, is a form of three-dimensional conformal ... This enables the clinician to **sculpt the radiation beams** to ...
www.bnpcc.org/files/1_2_1/ pdf/BNPCC%20202%20FOR%20PDF.pdf ...

Improvements in radiation therapy in the last half of the 20th century have ... It is the ability to “sculpt the dose away from sensitive structures” that ...
www.medicalimagingmag.com/ issues/articles/2003-10_01.asp



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Note added at 6 hrs 15 mins (2005-08-06 20:14:23 GMT)
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Here are some more examples:

... IMRT is a state-of-the art treatment that allows physicians to **\'\'sculpt\'\' radiation
to the contours of a tumor**, thereby sparing adjacent healthy tissue. ...
www.wellmont.org/About/In_the_News/news.cfm?id=992

The radiation oncologist then contours in the target area (ie, ... IMRT allows
the radiation oncologist to **sculpt the radiation beams** much more precisely ...
www.ohsu.edu/ohsuedu/academic/ som/radiationoncology/pts.cfm

... Transfer of Images and Contours Images of the patient’s scans are ... within the computer
controlled linear accelerator to “sculpt” the radiation dose to ...
www.scrippsclinic.net/media/pdf/imrtposter2.pdf



Delineation of tumor and normal tissue contours is performed by ... treatment
planning, the physician is able to **sculpt a radiation dose** around the target ...
varian.mediaroom.com/file.php/mr_varian/ spinsite_docfiles/147/VRM395+IMRT+White+Paper+Final+Jan+2005.pdf

and complex tissue contours such as the hourglass ... we have limitless possibilities
**to sculpt radiation**. dose (see Figure 2). Advanced treatment planning ...
www.oralcancerfoundation.org/ facts/pdf/radiation_types.pdf

I have translated an MRI(magnetic resonance imaging) technology patent, and they used expressions similar to this for similar operations.