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Otosclerosis: Anatomy and Pathology in the Temporal Bone Assessed by Multi-Slice and Cone-Beam CT.

Artikel i vetenskaplig tidskrift
Författare Ylva Dahlin Redfors
Hans-Göran Gröndahl
Johan Hellgren
Ninita Lindfors
Inger Nilsson
Claes Möller
Publicerad i Otology & neurotology
Volym 33
Nummer/häfte 6
Sidor 922-7
ISSN 1537-4505
Publiceringsår 2012
Publicerad vid Institutionen för odontologi
Institutionen för kliniska vetenskaper, Avdelningen för öron-, näs- och halssjukdomar
Institutionen för kliniska vetenskaper
Sidor 922-7
Språk en
Länkar www.ncbi.nlm.nih.gov/pubmed/2277199...
Ämnesord Cone beam computed tomography; Multi slice computed tomography; Otosclerosis; Stapedectomy; Temporal bone
Ämneskategorier Oto-rino-laryngologi

Sammanfattning

Objective: To assess the use of cone beam computed tomography (CBCT) compared with multi-slice computed tomography (MSCT) in otosclerosis, with special emphasis on middle- and inner-ear anatomy. Study Design: Prospective study. Patients: Twenty patients who underwent a stapedectomy 30 years ago were selected on the basis of bone conduction threshold values. Their mean age was 65 years (range, 48-76 yr). Intervention: All patients underwent CBCT and MSCT with a slice thickness of 0.5 to 0.6 mm. Main Outcome Measures: Sixteen middle- and inner-ear anatomic structures and stapedial prostheses were analyzed by visual grading analysis. To assess critical reproduction and thereby the clinical applicability of CBCT, a dichotomization was made. Assessment of otosclerotic foci was performed using a grading system dividing the lesions in; 1) sole fenestral lesions, 2) retrofenestral lesions with or without fenestral lesions and 3) severe retrofenestral lesions. Results: The 16 anatomic structures were clearly reproduced by both imaging techniques. However, there was an interobserver variation in judging the superiority of 1 method in favor of the other. Otosclerotic lesions were diagnosed in 80/95% using MSCT and 50/85% using CBCT (evaluators 1 and 2, respectively). Retrofenestral lesions were diagnosed in 5 of 10 of ears with severe-to-profound hearing loss, whereas no retrofenestral lesions were diagnosed in the 10 ears with mild-to-moderate hearing loss. The stapedial prostheses were adequately or very well reproduced by both methods. Conclusion: CBCT is a new imaging technique with a considerably lower radiation dose than conventional MSCT. Our study indicates that CBCT is suitable and, in many ways, equivalent to MSCT, for temporal bone imaging in otosclerosis.

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