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Evaluation of the Efficacy of a Small CdTe -Camera for Sentinel Lymph Node Biopsy

¹ Department of Oral and Maxillofacial Radiology, The Nippon Dental University School of Life Dentistry at Niigata, Niigata, Japan; and ² Department of Radiology, Hamamatsu University School of Medicine, Hamamatsu, Japan

Correspondence: For correspondence or reprints contact: Makoto Tsuchimochi, Department of Oral and Maxillofacial Radiology, The Nippon Dental University School of Life Dentistry at Niigata, 1-8 Hamaura-cho, Chuo-ku, Niigata, Niigata 951-8580, Japan. E-mail: tsuchimochi{at}ngt.ndu.ac.jp

We previously reported the basic performance of a prototype small cadmium telluride (CdTe) -camera (SSGC) intended for use in radioguided surgeries. In this study, we sought to confirm the favorable previous results and to extend the preliminary findings to examine the efficacy of the SSGC in an animal study and a clinical setting for sentinel lymph node biopsy. Methods: The prototype SSGC (1,024 pixels; field of view, 44.8 x 44.8 mm), equipped with a parallel-hole collimator, was used in both animal and clinical studies. ^99mTc-phytate (18.5 MBq) was injected into the tongues and legs of 6 rabbits. In the clinical study, 74 MBq of ^99mTc-phytate was injected into peritumoral regions in 8 patients with oral cancer. The detection of hot nodes by the SSGC was compared with that by a conventional scintillation -camera (CGC). Results: The SSGC detected 29 hot nodes in images of 6 rabbits after injection. The number of hot nodes was the same as the number seen in CGC studies, but the CGC required a longer acquisition time to produce comparable images. There were no differences between the SSGC and the CGC in terms of activity ratios and hot node-to-background ratios. The biodistribution of ^99mTc-phytate in removed tissues was evaluated by contact radiography, and radioactivity was assayed with a -well counter. The mean ± SD radioactivity in specimens was 0.15% ± 0.15%, with a range of 0.01%–0.62%. In the clinical study, the SSGC detected 30 hot nodes with a 5- to 60-s acquisition time at 4 h after injection. The SSGC documented all hot nodes depicted by the CGC at 4 h after injection. Conclusion: The SSGC showed significant potential for the detection of sentinel lymph nodes in lymphoscintigraphy. The results of the studies suggested that the SSGC facilitates the exploration of hot nodes in sentinel lymph node biopsy.

Key Words: lymphoscintigraphy • oncology • semiconductor -camera • CdTe • handheld -camera • sentinel lymph node biopsy • radioguided surgery • oral cancer

COPYRIGHT © 2008 by the Society of Nuclear Medicine, Inc.

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