TABLE 2.

Methods of Head and Neck Ablations in Chronological Order

Patient #	Guidance Modality	Reasons for Choice of Guidance Modality	Cryoprobe Type/Position	Ablation Times in minutes and Cryoprobe Flow Rates	Adjacent Major Structures Within 1mm
1	CT	PET-CT not yet utilized as guidance modality at our institution	IceSphere/middle aspect of mass IceSphere/inferior aspect of mass IceSeed/superior aspect of mass	15 freeze / 10 thaw / 10 freeze − 20% / 0% / 20% − 20% / 0% / 20% − 50% / 0% / 100%	carotid artery, jugular vein, vagus nerve
1	PET-CT	Confirm small target, ensure ice ball covers metabolically active region	IceSphere x2	15 freeze / 10 thaw / 10 freeze − 100% / 0% / 100%	carotid artery, jugular vein, vagus nerve
2	MRI	Deep location with many surrounding structures requiring precision placement	IceSeed x2	15 freeze / 10 thaw / 15 freeze - 100% / 0% / 100%	carotid artery, jugular vein, vagus nerve
3	PET-CT	Confirm ill-defined target, ensure ice ball covers metabolically active region	IceSphere x4 IceSphere/left aspect not in ice ball	15 freeze / 10 thaw / 15 freeze -100% / 0% / 100% -100% / 0% / 100%	airway stoma, neopharyngeal mucosa
4	PET-CT	Confirm ill-defined target, ensure ice ball covers metabolically active region	IceSeed x2/hypermetabolic region adjacent to vasculature	11 freeze / 4 freeze / 10 thaw/ 11 freeze / 4 freeze − 100% / 40% / 0% / 100% / 40%	vertebral artery, carotid artery, jugular vein, vagus nerve
5	PET-CT	Confirm small target, ensure ice ball covers metabolically active region	IceSphere/center ofmass	15 freeze / 10 thaw / 15 freeze − 100% / 0% / 100%	carotid artery, facial artery, esophagus
2	PET-CT	Deep location with many surrounding structures requiring precision placement	IceSeed/center of hyper metabolic region	Not performed	carotid artery, jugular vein, vagus nerve
6	MRI	Deep location with many surrounding structures requiring precision placement	IceRod/center ofmass	15 freeze / 10 thaw / 15 freeze − 100% / 0% / 100%	right temporal lobe, cavernous carotid artery
7	MRI	Deep location with many surrounding structures requiring precision placement	IceSeed/center of mass, submandibular approach	15 freeze / 10 thaw / 6 freeze / 4 freeze / 5 freeze − 60% / 0% / 60% / 80% / 100%	right temporal lobe, cavernous carotid artery