Foot Immobiliser For Use In Bone Spect

FOOT IMMOBILISER FOR USE IN BONE SPECT/CT

Code Description
16BT-FOOTIMMOB Foot Immobiliser for SPECT imaging

Feet and Inches: Development and Testing of a Bespoke Positioning Device to Immobilise the Feet During Bone SPECT/CT Imaging.


Authors: A Cheetham, S Anderson, N Gulliver, M Vadrucci, N Mulholland, G Vivian


Introduction:
Bone SPECT/CT is a useful tool for evaluation of the foot. However, movement during the acquisition will degrade scan quality. Additionally, the complex anatomy of the foot is more easily visualised if positioned in standard orthogonal planes.


In conjunction with a commercial supplier, a positioning device to immobilise the feet was designed. A solid baseplate of CT compatible material and recesses for heels keep the feet parallel to the transaxial plane, whilst a central bar and straps restrict lateral rotation.


Method:
20 SPECT/CT studies (10 with and 10 without the foot immobiliser) were retrospectively reviewed for motion and misregistration artefacts. To assess positioning, the long axis of the foot was defined as a line bisecting the third metatarsal phalangeal joint and the posterior aspect of the talarcalcaneal joint. Degree of the foot’s flexion/extension was measured relative to the scanner’s transaxial plane, and lateral rotation relative to the sagittal plane.


Results:
With the immobiliser, no motion is seen on the raw SPECT data, and one case of slight misregistration. Without the immobiliser, 2 cases of motion are seen and 6 cases of misregistration. With the immobiliser the average foot was flexed -23 degrees (-17 to -37) to the transaxial plane, and rotated laterally -10 degrees (-22 to 2). Without the immobiliser flexion was -53 degrees (-31 to -74) and the rotation -10 degrees (-25 to 19).

Conclusion:
Foot immobilisation improves imaging, by reducing motion and misregistration artefacts. Enhanced positioning relative to standard orthogonal planes helps with visualisation of the anatomy.

DOWNLOAD OUR LATEST BROCHURE
OUR CERTIFICATION
OUR CERTIFICATION