Computed tomography with adjusted dose for body mass index may be superior to whole-body radiography especially in elderly patients with multiple myeloma

Author:

Weber Lars1ORCID,Hansson Markus23ORCID,Geijer Mats456ORCID

Affiliation:

1. Medical Radiation Physics, Department of Clinical Sciences Lund, Lund University and Radiation Physics, Division of Hematology, Oncology and Radiation Physics, Skane University Hospital, Lund, Sweden

2. Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg and Region Västra Götaland, Sahlgrenska University Hospital, Department of Hematology, Gothenburg, Sweden

3. Hematology, Division of Hematology, Oncology and Radiation Physics, Skane University Hospital, Lund, Sweden

4. Department of Radiology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

5. Region Västra Götaland, Sahlgrenska University Hospital, Department of Radiology, Gothenburg, Sweden

6. Department of Clinical Sciences Lund, Lund University, Lund, Sweden

Abstract

Background Whole-body skeletal radiography has traditionally been used in the management of multiple myeloma for defining treatment strategies. For several reasons, radiography has been replaced by computed tomography (CT) covering the same regions. Purpose To evaluate the body mass index (BMI) adjusted effective radiation dose from two different methods of whole-body radiologic imaging for multiple myeloma assessment. Material and Methods The current investigation analyses the dose to patients resulting from the two methods, conventional radiography supplemented with tomosynthesis (203 examinations) and CT (264 examinations). All patients subject to myeloma staging for 4.5 years were included in the study. Exposure parameters were collected from the PACS and conversion factors were calculated using the software packages PCXMC and VirtualDose enabling the calculation of the effective dose to each patient based on BMI. The Mann–Whitney U test was used for comparisons between groups. Results Patients were subject to a median effective dose of 2.5 mSv for conventional radiography and 5.1 mSv for CT, a statistically significant difference. Conclusion The effective dose for whole-body CT in assessing multiple myeloma is twice as high as for whole-body skeletal survey with modern digital radiography, but at a low level and considerably less than the levels quoted in the earlier studies of ∼30 mSv when the technique was first explored.

Funder

Lund University Medical Faculty Foundation

Publisher

SAGE Publications

Subject

Radiology, Nuclear Medicine and imaging,General Medicine,Radiological and Ultrasound Technology

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