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Exposure levels from radiology procedures used in myeloma diagnostics

Weber, Lars LU ; Kristiansson, Ingvar ; Hansson, Markus LU orcid ; Siemund, Roger ; Geijer, Håkan and Geijer, Mats (2019) European Congress of Radiology In Insights into Imaging 10(Suppl 1). p.440-441
Abstract
Purpose: Myeloma diagnostics have traditionally been performed using a radiographic skeletal survey. CT scanning has been suggested as a replacement and has been introduced in our institution. Effective doses have been reported in the literature, without correlation with body mass index (BMI). We have evaluated the effective doses imparted to the patients during this procedure.

Methods and Materials: Length, weight and dose-length product were collected for each patient and CT examination. Conversion factors based on BMI were generated using Monte Carlo based simulations on voxel-based phantoms (n=5). For each phantom size a sex and BMI-specific conversion factor was generated. Subsequently individual conversion factors were... (More)
Purpose: Myeloma diagnostics have traditionally been performed using a radiographic skeletal survey. CT scanning has been suggested as a replacement and has been introduced in our institution. Effective doses have been reported in the literature, without correlation with body mass index (BMI). We have evaluated the effective doses imparted to the patients during this procedure.

Methods and Materials: Length, weight and dose-length product were collected for each patient and CT examination. Conversion factors based on BMI were generated using Monte Carlo based simulations on voxel-based phantoms (n=5). For each phantom size a sex and BMI-specific conversion factor was generated. Subsequently individual conversion factors were generated through exponential curve fitting. Finally, the effective dose was calculated for each patient based on sex and BMI.

Results: The sex averaged conversion factors for underweight, normal weight and obese patients (BMI = 18, 21 and 25, respectively) were 0.011, 0.011 and 0.010 mSv/mGycm, respectively. The median effective dose for a scan length from the top of the head to the knees was 5.1 mSv (n=256, range = [2.7, 12.6]) for all patients. Dose levels in our institution are comparable with published data but higher than for conventional skeletal imaging.

Conclusion: CT scanning for myeloma diagnostics in our institution showed higher doses than has been published for conventional skeletal imaging but is still comparable to other investigations into this methodology. The advantages in terms of shorter examination times are perceived to be positive for the predominantly elderly patients where dose concerns are of less importance.
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author
; ; ; ; and
publishing date
type
Contribution to journal
publication status
published
subject
in
Insights into Imaging
volume
10
issue
Suppl 1
pages
2 pages
publisher
Springer
conference name
European Congress of Radiology
conference location
Vienna, Austria
conference dates
2019-02-27 - 2019-03-03
ISSN
1869-4101
language
English
LU publication?
no
id
5112b362-5b4f-4346-81af-39d48ebfdbc8
date added to LUP
2020-12-09 13:49:21
date last changed
2020-12-10 15:03:27
@misc{5112b362-5b4f-4346-81af-39d48ebfdbc8,
  abstract     = {{Purpose: Myeloma diagnostics have traditionally been performed using a radiographic skeletal survey. CT scanning has been suggested as a replacement and has been introduced in our institution. Effective doses have been reported in the literature, without correlation with body mass index (BMI). We have evaluated the effective doses imparted to the patients during this procedure.<br/><br/>Methods and Materials: Length, weight and dose-length product were collected for each patient and CT examination. Conversion factors based on BMI were generated using Monte Carlo based simulations on voxel-based phantoms (n=5). For each phantom size a sex and BMI-specific conversion factor was generated. Subsequently individual conversion factors were generated through exponential curve fitting. Finally, the effective dose was calculated for each patient based on sex and BMI.<br/><br/>Results: The sex averaged conversion factors for underweight, normal weight and obese patients (BMI = 18, 21 and 25, respectively) were 0.011, 0.011 and 0.010 mSv/mGycm, respectively. The median effective dose for a scan length from the top of the head to the knees was 5.1 mSv (n=256, range = [2.7, 12.6]) for all patients. Dose levels in our institution are comparable with published data but higher than for conventional skeletal imaging.<br/><br/>Conclusion: CT scanning for myeloma diagnostics in our institution showed higher doses than has been published for conventional skeletal imaging but is still comparable to other investigations into this methodology. The advantages in terms of shorter examination times are perceived to be positive for the predominantly elderly patients where dose concerns are of less importance.<br/>}},
  author       = {{Weber, Lars and Kristiansson, Ingvar and Hansson, Markus and Siemund, Roger and Geijer, Håkan and Geijer, Mats}},
  issn         = {{1869-4101}},
  language     = {{eng}},
  note         = {{Conference Abstract}},
  number       = {{Suppl 1}},
  pages        = {{440--441}},
  publisher    = {{Springer}},
  series       = {{Insights into Imaging}},
  title        = {{Exposure levels from radiology procedures used in myeloma diagnostics}},
  volume       = {{10}},
  year         = {{2019}},
}