ruprecht at BLUE.WEEG.UIOWA.EDU
Thu Sep 20 10:21:23 PDT 2001
Thank you for your timely response.
I shall respond to your comments on ORAD, inasmuch as this may be of
interest to others, who may also have comments. Our Digital Imaging
Task Force did consider your other comments, and felt that some of
this was like fortunetelling. We wondered about what would happen
with other digital imaging modalities, and felt that it was too early
We are considering the probability of other memory requirements, for example
for digital still and video clinical images,
for predictive imaging (cosmetic/esthetic dentistry, orthognathic
surgery, orthodontics etc.),
for scanning in older but still "current" radiographs that were required, and
for histopathology images as part of a histopathology report
Also, we were wondering about post-processed radiographic images. The
consideration here was that images would be stored as captured, i.e.
native. OM Radiology might post-process images to optimize them and
store these as the working images. At first we thought that any other
post-processing that was carried out anywhere else in the college
would not be stored on the central server, as this would quickly add
up to a large volume of space (what with the likelihood that no one
would ever remove an image). We had thought that these images would
be stored on the departments own computers (to discourage excessive
storage of every nuance of change). However, the new HIPAA (Health
Insurance Portability and Accountability Act) mandates electronic
security, and this would, probably be a violation of HIPAA. How are
you dealing with post-proceesed images versus native images.
>As a rule of thumb:
>- intra-oral images are 300 - 400 KB (depending on the make of the sensor)
>- extra-oral images are 4 - 6 MB (same).
>Mulptiply the anticipated yearly "production" with the file size for each
>image type and you get the storage space you need. These numbers do not take
>file compression into account, but a lossless file compression will buy you
>only 30% extra at the most.
>We installed storage space for what we think is required over a period of 3-4
>years, although x-rays have to be kept available longer. The reason is that
>the costs of disk space is dropping every year. That makes it probably more
>cost effective to buy additional dik space after a few years, than buying a
>system that is large enough for many years straight from the beginning.
>Other things to consider are:
>- were is the patient management database located (requires storage space as
>well, but preferably not on the same disk as the images)?
>- do you want to include intra-oral video images as well?
>- how is the optimum performance of the database engine (sometimes the
>performance drops when the disk is full over a critical threshold)? This is
>something you IT(database) people can tell you.
>I hope this helps.
>- - - - - - - - - - - - - - Original Message - - - - - - - - - - - - - -
>On Thu Sep 20 14:11:43 2001,
>"Axel Ruprecht" <ruprecht at BLUE.WEEG.UIOWA.EDU> wrote:
> >For those of you out there who are using digital radiography systems
> >for general clinical purposes, could you please tell me how much
> >memory, on average, you have allocated per patient, per year for
> >storage of the digital radiographs that are made?
> >I ask, on average, because , of course, this will vary from year to
> >year, but for any given time frame there must be some plan as to how
> >much memory is needed. we are looking at what we would need, were we
> >to proceed.
> >Thank you.
> >Axel Ruprecht D.D.S., M.Sc.D., F.R.C.D.(C)
> >Professor and Director of Oral and Maxillofacial Radiology
> >Professor of Radiology
> >Professor of Anatomy and Cell Biology
> > (O) 319-335-7341
> > (FAX) 319-335-7351
> > e-mail:axel-ruprecht at uiowa.edu
> > mail: University of Iowa - DSB
> > Iowa City IA 52242-1001
> >Web: http://ruprecht.radiology.uiowa.edu
> >The only man who ever got all his work
> >done by Friday was Robinson Crusoe.
>- - - - - - - - - - - - End of Original Message - - - - - - - - - - - -
Axel Ruprecht D.D.S., M.Sc.D., F.R.C.D.(C)
Professor and Director of Oral and Maxillofacial Radiology
Professor of Radiology
Professor of Anatomy and Cell Biology
e-mail:axel-ruprecht at uiowa.edu
mail: University of Iowa - DSB
Iowa City IA 52242-1001
The only man who ever got all his work
done by Friday was Robinson Crusoe.
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