X-ray "positives" are easily created through digital technology.
X-ray "prints" maintain the x-ray's visual integrity and
present the image as the radiologist would read it. Since the eye
is drawn to the brightest part of an image, the internal fixations,
rendered in white, stand out sharply.
These
just happen to be MY films from my foot surgery, printed with permission
of Dr. Jonathan Deland, Hospital for Special Surgery, NYC. (No,
I am not getting paid for the plug!) So, you choose! Besides, isn't
the moon more romantic against a dark sky?
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Paper
prints of radiology films such as X-rays, MRI's, CAT scans, etc. have
been used as courtroom exhibits for a number of years. The advantage
of presenting the material in this fashion is the elimination of the
need of an illuminator (sometimes called a shadow-box) that needs
to be plugged in to an outlet, limiting the location of the exhibit
with respect to the jury. However, the terminology can be quite confusing
as different methods of creating these exhibits can yield varying
final image interpretations.
The first and
easiest way of printing X-rays was to place the x-ray against a
piece of photographic paper in a darkroom, expose it to light and
process the paper. This method is called CONTACT PRINTING. When
making contact prints from X-rays, however, anything white on the
film will be black on the print, and anything black on the film
will be white on the print. This creates a POSITIVE image, or REVERSAL
image. This is fine when working with traditional photographic negatives
in order to render an image that is realistic to the way the eye
normally views the world. But in radiology imaging, the X-ray film
is the normal image by which diagnoses and interpretations are made.
Today, positive images are easily created through digital technology
which eliminates the need to make photographic negatives for enlargement.
If you have a
chest film and the doctor testifies that he observed a dark spot
on the film that suggested a tumor, then it better be a dark spot
on the final exhibit! This is easily accomplished by making a copy
negative of the original film, then placing this negative in a traditional
enlarger for printing. When ordering X-ray prints from The Evidence
Store, what is black on the x-ray will be black on the print, and
so forth.
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