Value of a Lower-Limb Immobilization Device for Optimization of SPECT/CT Image Fusion

Journal of Nuclear Medicine Technology

Joana do Mar F. Machado¹  John O. Prior¹  José A. Pires-Jorge¹  Victor Fernandes Vieira¹  Jean-Aybert Collinot¹  Lina Vieira¹  Marina S. Monteiro¹ 

关键词: SPECT/CT;    misalignment;    lower limb;    patient motion;   

DOI  :  10.2967/jnmt.114.145771

学科分类：医学（综合）

来源: Society of Nuclear Medicine

【 摘 要 】

The foot and the ankle are small structures commonly affected by disorders, and their complex anatomy represents a significant diagnostic challenge. By providing information on anatomic and bone structure that cannot be obtained from functional imaging, SPECT/CT image fusion can be particularly useful in increasing diagnostic certainty about bone pathology. However, because of the lengthy duration of a SPECT acquisition, a patient’s involuntary movements may lead to misalignment between SPECT and CT images. Patient motion can be reduced using a dedicated patient support. We designed an ankle- and foot-immobilizing device and measured its efficacy at improving image fusion. Methods: We enrolled 20 patients who underwent SPECT/CT of the ankle and foot with and without a foot support. The misalignment between SPECT and CT images was computed by manually measuring 14 fiducial markers chosen among anatomic landmarks also visible on bone scintigraphy. ANOVA was performed for statistical analysis. Results: The absolute average difference without and with support was 5.1 ± 5.2 mm (mean ± SD) and 3.1 ± 2.7 mm, respectively, which is significant (P < 0.001). Conclusion: The introduction of the foot support significantly decreased misalignment between SPECT and CT images, which may have a positive clinical influence in the precise localization of foot and ankle pathology.

【 授权许可】

Unknown