Imaging of Electrode Position after Cochlear Implantation with Flat Panel CT

Table 1

Patients and evaluation parameters of imaging.

Code	Age	Implant type	Artefact (1–6)		Full insertion	Tip fold over	Separation of electr.	Facial nerve	Differentiation of scalae
			Inv I/Inv II
PW49	60	CN	4	3	+	−	−	?	−
KE36	73	CN	2	2	+	−	−	+	−
MG57	52	CN	2	3	+	−	−	?	−
LE46	63	CN	3	3	+	−	−	?	−
PB42	67	CN	2	2	+	−	−	+	−
WF52	57	ME	3	2	+	−	+	+	−
DM77	32	ME	4	3	+	−	+	?	−
UA74	35	CN	2	3	+	−	−	?	−
PU47	62	CN	3	3	+	−	−	?	−
OG57	52	AB	3	3	+	−	+	+	+
DU62	47	ME	2	2	+	−	+	−	−
BN77	33	CN	2	2	+	−	−	+	−
OK53	57	CN	3	4	+	−	−	+	−
KD67	43	CN	2	2	+	−	−	?	−
FM50	60	AB	3	3	+	−	+	−	−
WM65	45	CN	2	2	+	−	−	+	−
DR62	48	CN	2	2	+	−	−	+	−
LS71	39	CN	3	4	+	−	−	+	−
SP67	43	CN	2	3	+	−	−	+	−
BR63	47	AB	2	3	+	−	−	+	−
GH50	60	CN	3	3	+	−	+	−	−
ÖT67	43	CN	1	2	+	−	−	+	+
SM39	71	CN	2	3	+	−	−	?	−
HA51	59	CN	3	4	+	−	−	+	−
CE39	71	CN	2	3	+	−	−	+	−
WJ76	34	CN	3	3	+	−	−	?	−
GJ62	48	CN	4	4	+	−	−	+	−
ZT56	54	CN	1	2	+	−	−	−	+
TK75	35	CN	2	2	+	−	+	+	−
WJ40	70	AB	2	2	+	−	+	?	−
PD88	22	CN	1	2	+	−	−	?	+

Implant type: CN: Cochlear Nucleus CI512; ME: Medel Sonata Ti; AB: Advanced Bionics Hi Res 90.
Artefacts: 1: no artefacts and 6: evaluation impossible due to multiple artefacts.
Inv. I, II: investigator 1, investigator 2.
Full insertion +: all electrodes within cochlea; −: one or more electrodes outside cochlea.
Tip fold over +: tip of electrode is folded in the apical part; −: tip of electrode array is straight.
Separation of electrodes: +: single electrodes are clearly visible; −: no differentiation of single electrodes due to artefacts.
Position of facial nerve in projection to cochlea: +: clearly visible; −: not possible.
Differentiation of scalae tympani and vestibuli: +: clearly visible; /not possible.
Visualization of osseous lamina spiralis: +: clearly visible; −: not possible.