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Tuesday, March 16, 2000

Holographic assessment has proven value in diagnosis of pediatric spine pathologies

Holographic assessment of a range of complex pathologies involving the pediatric spine has proven of value in making or confirming the diagnosis, aiding in pre-surgical planning and assisting in pre-operative management, according to a study in scientific exhibit 4, presented by John P. Dormans, MD, chief of orthopaedic surgery at The Children's Hospital of Philadelphia.

The study assesses the clinical utility of true 3-D holographic display in the overall management of complex/atypical pathologies affecting the pediatric spine. The researchers said children with highly unusual spinal deformity were evaluated either by computerized tomography or by MRI. The CT slices, CT reformations and 3-D CT renderings or MRI were compared to 3-D holograms (DH Corp.-Voxel Medical), generated in three planes from the same CT or MR data set.

These transparent, lifesize, 3-D holograms stored on ultra high resolution emulsion are displayed on a specially designed, portable, white light viewbox, providing a 45 degree viewing angle with two degrees of freedom within a 15cm depth of field. By projecting out in 3-D space in front and behind the film, these holographic "anatomical twins" of the patient's anatomy allows the surgeon to directly measure and interact in 3-D.

The cohort comprised five cases of torticollis secondary to atlanto-axial rotary subluxation; 19 cases of congenital craniocervical anomaly, with final diagnoses ranging from Klippel-Feil to basilar invagination and including one case of neurofibromatosis and one of Hadju-Cheney disease; one case of congenital scoliosis; and one case of fibrosis ossificans progressive.

The researchers said in all cases the hologram was quicker and easier to read from a limited number of films while adding new information and understanding in some cases that could not be obtained from the original data set alone.

In addition to Dr. Dormans, the researchers included Jill Hunter, MD, of The Children's Hospital of Philadelphia; and Raymond Schulz, DH Corp. Voxel Medical, vice president.

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Last modified 23/February/2000 by IS