Comparison between Whole Body and Head and Neck Neurovascular Coils for 3T Magnetic Resonance Proton Resonance Frequency Shift Thermography Guidance in the Head and Neck Region Start Time: 9/18/2017, 1:30 PM Author(s)

Details Purpose: To compare the image quality of magnetic resonance (MR) treatment-planning images and proton resonance frequency (PRF) shift thermography images and inform coil selection for MR-guided laser ablation of tumors in the head and neck region. Methods: Laser ablation was performed on an agar phantom and monitored via MR PRF shift thermography on a 3T scanner, following acquisition of T1-weighted (T1W) planning images. PRF shift thermography images and T2-weighted (T2W) planning images were also performed in the neck region of five normal human volunteers. Signal-to-noise ratios (SNR) and temperature uncertainty were calculated and compared between scans acquired with the whole body coil and a head and neck neurovascular coil. Results: T1W planning images of the agar phantom produced SNRs of 4.0 and 12.2 for the body coil and head and neck neurovascular coil, respectively. The SNR of the phantom MR thermography magnitude images obtained using the whole body coil was 14.4 versus 59.6 using the head and neck coil. The average temperature uncertainty for MR thermography performed on the phantom with the body coil was 1.1°C versus 0.3°C with head and neck coil. T2W planning images of the neck in five human volunteers produced SNRs of 28.3 and 91.0 for the body coil and head and neck coil, respectively. MR thermography magnitude images of the neck in these volunteers obtained using the whole body coil had a signal-to-noise ratio of 8.3, while the SNR using the head and neck coil was 16.1. The average temperature uncertainty for MR thermography performed on the volunteers with the body coil was 2.5°C versus 1.6°C with the head and neck neurovascular coil. Conclusion: The whole body coil provides inferior image quality for both basic treatment-planning sequences and MR PRF shift thermography compared with a neurovascular coil, but may nevertheless be adequate for clinical purposes. Comparison of CT-guided core-needle biopsy and fine-needle aspiration in the assessment of head and neck lesions Start Time: 9/18/2017, 1:38 PM Author(s) Abdul Rahman Tarabishy, MD Assistant Professor of Radiology West Virginia University Role: Presenting Author Matthew David Schmidt, BS Medical Student West Virginia University Abstract Details BACKGROUND AND PURPOSE: Fine needle aspiration (FNA) and core needle biopsy (CNB) have both been established as efficient diagnostic tools for image-guided biopsy of head and neck lesions. FNA has emerged as the preferred diagnostic tool in most situations due to a lower risk of complications with retained efficacy. If the diagnostic yield of CNB is significantly higher than that of FNA with a minimal complication risk, CNB should be considered instead of FNA. This study aims to compare the diagnostic yield of CT-guided FNA and CNB and to support the safety of both biopsy modalities in head and neck lesions.Details BACKGROUND AND PURPOSE: Fine needle aspiration (FNA) and core needle biopsy (CNB) have both been established as efficient diagnostic tools for image-guided biopsy of head and neck lesions. FNA has emerged as the preferred diagnostic tool in most situations due to a lower risk of complications with retained efficacy. If the diagnostic yield of CNB is significantly higher than that of FNA with a minimal complication risk, CNB should be considered instead of FNA. This study aims to compare the diagnostic yield of CT-guided FNA and CNB and to support the safety of both biopsy modalities in head and neck lesions. MATERIALS AND METHODS: Retrospective study of 168 patients underwent CTguided biopsy and the data collected included age, gender, lesion location, biopsy modality, primary diagnosis applicable to the lesion, pathology results, and complications. RESULTS: The overall diagnostic rates of FNA and CNB biopsy were 60% and 89%, respectively (P < .0001). CNB demonstrated significantly higher diagnostic yield than FNA for lesions in lymph nodes, parotid glands, and the parapharyngeal space. CNB was also significantly better at diagnosing new lesions as well as lesions in patients with known metastatic disease. One complication was noted in a patient who underwent CNB and developed a moderate neck hematoma requiring overnight admission. CONCLUSIONS: CNB carries a very low complication rate and superior to FNA in obtaining diagnostic samples in head and neck lesions. Differential diagnosis of odontogenic lesions based on the imaging characteristics of gubernaculum tracts Start Time: 9/18/2017, 1:46 PM Author(s) Masafumi Oda, DDS, PhD Research Scholar of Radiology, Assistant professor of Oral and maxillofacial Radiology Boston University School of Medicine, Kyushu Dental University Role: Presenting Author Keita Onoue, MD Radiology Resident Boston Medical Center Role: Author Margaret N. Chapman, MD Neuroradiologist, Assistant Professor of Radiology Boston Medical Center, Boston University School of Medicine Role: Author Tatsurou Tanaka, DDS, PhD Associate professor of Oral and maxillofacial Radiology Kyushu Dental University Role: Author Yasuhiro Morimoto, DDS, PhD Professor of Oral and maxillofacial Radiology Kyushu Dental University Role: Author Osamu Sakai, MD, PhD Chief of Neuroradiology, Professor of Radiology, Otolaryngology-Head and Neck Surgery, and Radiation Oncology Boston Medical Center, Boston University School of Medicine