Title :
Hand-held gamma-ray imaging device for localization of sentinel lymph nodes
Author :
MacDonald, L.R. ; Yamaguchi, Y. ; Tikhomirov, E.A. ; Pirogov, A.M. ; Patt, B.E. ; Iwanczyk, J.S. ; McElroy, D. ; Hoffman, E.J. ; Alazraki, N.P. ; Aarsvold, J.N. ; Mintzer, R.A.
Author_Institution :
Gamma Medica Instrum., Northridge, USA
Abstract :
A hand-held scintillation camera has been developed for localizing Sentinel Lymph Nodes (SLN) during or prior to surgery. Use of gamma proves has increased in recent years to identify SLNs as these are increasingly implicated in the spread of cancerous cells. The functionality of this new imaging probe will go beyond that of current non-imaging devices by displaying activity distributions in addition to counting rates. Using different collimators changes the spatial resolution, sensitivity and field of view (FOV) of the camera. In addition, the camera produces audible tones proportional to the count rate. The tone is modulated in real time to indicate the presence of complex distributions of activity within the FOV. The modulated tone alerts the user to localized concentrations of activity that may be nodes. The 22 mm FOV camera has 1 mm intrinsic spatial resolution. System FWHM in air is 2.1 mm and 2.6 mm at 0 cm and 1 cm from a high-resolution parallel hole collimator, respectively. FWHM of 3.8 mm is measured 2 cm from a 3 mm pinhole. Pinhole sensitivity is 600 cps/MBq above a 125 cps/MBq background for a 1 cm lesion 1 cm below a water surface. Nodes are identified in images even when overall count rate is not above background
Keywords :
biomedical equipment; cameras; cancer; gamma-ray detection; radioisotope imaging; 1 cm; 1 mm; 22 mm; activity distributions; camera field of view; camera sensitivity; cancerous cells spread; counting rates; hand-held gamma-ray imaging device; high-resolution parallel hole collimator; intrinsic spatial resolution; medical instrumentation; pinhole sensitivity; sentinel lymph nodes localization; spatial resolution; Biomedical imaging; Cameras; Collimators; Lymph nodes; Nuclear imaging; Oncological surgery; Optical imaging; Probes; Spatial resolution; Surgical instruments;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2000 IEEE
Conference_Location :
Lyon
Print_ISBN :
0-7803-6503-8
DOI :
10.1109/NSSMIC.2000.949340
