Re: Effective Dose from various procedures -Reply

[Chris Alston <alstonc@odrge.odr.georgetown.edu>]

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>Disposition-Notification-To: "Nikolaos A. Gkanatsios" <nikos@ufl.edu>
>Date:         Wed, 8 Apr 1998 01:25:01 -0400
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>From: "Nikolaos A. Gkanatsios" <nikos@UFL.EDU>
>Subject:      Re: Effective Dose from various procedures -Reply
>To: Multiple recipients of list MEDPHYS <MEDPHYS@LISTS.WAYNE.EDU>
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>You can try using the following two references to get a good estimate of the
>effective doses for the procedures you described as they apply to your
>institution:
>
>Gkanatsios NA, Huda W.  "Computation of energy imparted in diagnostic
>radiology."  Medical Physics 24: 571-579 (1997).
>
>Huda W, Gkanatsios NA.  "Effective dose and energy imparted in diagnostic
>radiology."  Medical Physics 24: 1311-1316 (1997).
>
>Nikolaos A. Gkanatsios, MS
>Radiological Physics Division
>Department of Radiology
>University of Florida
>
>nikos@ufl.edu
>http://nersp.nerdc.ufl.edu/~nikos
>
>
>-----Original Message-----
>From:   Medical Physics Listserver [mailto:medphys@LISTS.WAYNE.EDU] On Behalf
>Of Michael Bleazard
>Sent:   Tuesday, April 07, 1998 11:23 PM
>To:     Multiple recipients of list MEDPHYS
>Subject:             Re: Effective Dose from various procedures -Reply
>
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>Joel
>
>Thanks for the information.  I have offered my services to do these
>measurements, unfortunately, the radiologist in question is from a
>private practice external to this hospital.  The mere suggestion of
>taking such measurements would mean downtime on their equipment and
>immediately register big dollar signs...no chance.
>
>Thanks again.
>
>Michael Bleazard
>Medical Physicist
>=================================
>Department of Nuclear Medicine
>Royal Brisbane Hospital
>Herston Rd
>QLD  Australia
>------------------------------------------------
>Tel: +61 7 3253 8905
>Fax +61 7 3253 8481
>E-mail: bleazardm@health.qld.gov.au
>================================
>
>
>>>> "Joel E. Gray, Ph.D." <joelgray@M3.SPRYNET.COM> 8/April/1998 01:00pm
>>>>
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>Michael,
>
>Extreme Caution is Urged!!  There is really no such thing as a "typical"
>exposure since the variability from one institution to another (and even
>within an institution) is rather extreme.
>
>For example, a US Food and Drug Administration survey, NEXT (Nationwide
>Evaluation of X-Tray Trends) indicates that the range of exposures for
>an
>AP lumbar spine are from a minimum of 6.2 mR to 2,154 mR, a max/min
>ratio
>of 34.7!  CT of the head ranges from 1,600 to 14,000 mR.
>
>If the radiologist wants estimates for procedures at his or her facility
>then it will be necessary to measure the exposures at that site!
>
>Please let me know if I can be of help.
>
>          Joel
>
>Joel E. Gray, Ph.D., Consultant
>2804 Second Street SW, Suite 334
>Rochester, Minnesota 55902
>
>Ph  507-286-8910
>Cell Ph  507-269-4247
>Fax  507-286-8910
>e-mail  joelgray@m3.sprynet.com
>
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>
>>         ** Mail from Medphys Listserver **
>>If you reply to this message, it will be posted on Medphys for all the
>>subscribers to review ...
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>>
>>Dear All
>>
>>I have been asked by a Radiologist for information regarding effective
>>dose to patients from a number of procedures.  I do not have recent
>data
>>for some of the particular studies he is after.  Would anyone have
>>typical entrance skin exposure and effective dose data from their
>>institution for the following procedures?
>>
>>Full lumbar spine series including obliques
>>LAT lumbar spine
>>Oblique lumbar spine
>>
>>He is also after typical effective dose for the following scans:
>>
>>Nuclear medicine bone scan
>>CT scan of lower three lumbar discs
>>reverse gantry CT scan of lower discs
>>
>>Any information would be most appreciated.  Thanks you in advance.
>>
>>Kind Regards
>>
>>Michael Bleazard
>>Medical Physicist
>>=================================
>>Department of Nuclear Medicine
>>Royal Brisbane Hospital
>>Herston Rd
>>QLD  Australia
>>------------------------------------------------
>>Tel: +61 7 3253 8905
>>Fax +61 7 3253 8481
>>E-mail: bleazardm@health.qld.gov.au
>>================================
>