KISEP Otology Korean J Otolaryngol 2004;47: 정상측두골전산화단층사진상내이구조물의계측 부산대학교의과대학이비인후과학교실, 1 진단방사선과학교실 2 고의경 1 박성환 1 윤빛나 1 이일우 1 노환중 1 전경명 1 김학진 2 Nor

Size: px

Start display at page:

Download "KISEP Otology Korean J Otolaryngol 2004;47: 정상측두골전산화단층사진상내이구조물의계측 부산대학교의과대학이비인후과학교실, 1 진단방사선과학교실 2 고의경 1 박성환 1 윤빛나 1 이일우 1 노환중 1 전경명 1 김학진 2 Nor"

동규 지
5 years ago
Views:

1 KISEP Otology Korean J Otolaryngol 2004;47: 정상측두골전산화단층사진상내이구조물의계측 부산대학교의과대학이비인후과학교실, 1 진단방사선과학교실 2 고의경 1 박성환 1 윤빛나 1 이일우 1 노환중 1 전경명 1 김학진 2 Normative Measurements of the Inner Ear Structures on Temporal Bone CT Images Using PACS Eui Kyung Goh, MD 1, Sung Hwan Park, MD 1, Bit Na Yoon, MD 1, Il Woo Lee, MD 1, Hwan Jung Roh, MD 1, Kyong Myong Chon, MD 1 and Hak Jin Kim, MD 2 1 Department of Otolaryngology-Head and Neck Surgery and 2 Radiology, Pusan National University College of Medicine, Busan, Korea ABSTRACT Background and Objectives:The reports of normative measurements for inner ear structure using computer-based programs are rare. The purpose of this study was to measure the normative data of the Korean inner ear structures and establish the basic data for diagnosis of congenital inner ear anomaly. Subjects and Method:Temporal bone CT of 38 patients 16 men and 22 women without apparent disease of middle and inner ear, fractures or major disorder such as seizure or tumor were retrospectively reviewed. Fifteen dimensions on axial views and 9 dimensions on coronal views were measured in PACS using π-view program. The slice thickness of CT was 0.6 mm. Results:From the axial view, the canal diameter of SSCC was 1.09±0.15 mm, the bony island width was 5.70±0.50 mm, the bony island width of LSCC was 3.99±0.58 mm, the cochlear upper turn width & height were each 5.63±1.07 and 3.03±0.65 mm. The vestibular aqueduct were observed 95.3%. From the coronal view, the cochlear height was 5.14±0.36 mm. The length of IAC was significantly longer in male than female p0.05 and the opening site of IAC was significantly wider in the left than the right p0.05. The upper turn of cochlea in good bone conduction 10 B had larger width and smaller height than those in poor bone conduction 10 db. Conclusion:We established the Korean normative measurements of the inner ear structures, which can be used for further diagnosis of the inner ear anomaly. (Korean J Otolaryngol 2004;47:827-32) KEY WORDS:Temporal bone Labyrinth X ray computed tomography Measurement

Canal diameter and bony island width of superior

The ampulla of superior semicircular canal B was

Bony island width of lateral semicircular canal C with

limb length of posterior semicircular canal D and cochlea

Basal turn of the cochlea E was checked at oval window

basal turn The upper turn of the cochlea had two

The largest length of IAC from the bony crest to the

2 정상내이구조물의계측 A B C D E F G H Fig. 1. Axial inner ear measurements. Canal diameter and bony island width of superior semicircular canal A were measured at maximum size. The ampulla of superior semicircular canal B was identified just before entering the vestibule. Bony island width of lateral semicircular canal C with ring shape was measured at maximum diameter. limb length of posterior semicircular canal D and cochlea was measured. Basal turn of the cochlea E was checked at oval window level and upper turn F separated by imaginary line from basal turn was measured. The upper turn of the cochlea had two parallel turn from apex to bottom. The largest length of IAC from the bony crest to the opening of IAC was measured and the opening width between the angulating points to the posterior cranial fossa was checked G. The width of each vestibular aqueduct H was measured at midpoint. 828 Korean J Otolaryngol 2004;47:827-32

고의경외 A B C D Fig. 2. Coronal inner ear measurements.

The largest size was checked at cochlear height and vestibule C,D. Table 1.

700.50 Ampulla diameter 01.170.20 PSCC Canal diameter 01.050.19 Limb length 06.740.74 LSCC Bony island width 03.990.

65 IAC Length 11.541.77 Opening width 07.011.41 05.310.36 03.030.44 VA 00.890.16 Coronal SSCC Bony island width 05.590.

3 고의경외 A B C D Fig. 2. Coronal inner ear measurements. The bony island width of superior semicircular canal A and lateral semicircular canal B were measured at maximum size. The largest size was checked at cochlear height and vestibule C,D. Table 1. Measurement of the inner ear structures Scan Structure Measuremnt MeanSDmm Axial SSCC Canal diameter Bony island width Ampulla diameter PSCC Canal diameter Limb length LSCC Bony island width Cochlea Basal turn width Basal turn height Upper turn width Upper turn height IAC Length Opening width VA Coronal SSCC Bony island width Canal diameter LSCC Bony island width Canal diameter Cochlea Height IAC Length Opening width SSCCsuperior semicircular canal, PSCCposterior semicircular canal, LSCClateral semicircular canal, IACinternal auditory canal, VAvestibular aqueduct 829

4 정상내이구조물의계측 Table 2. Difference according to sex Scan Structure Measuremnt Male n MeanSDmm Female n24 Axial SSCC Canal diameter Bony island width Ampulla diameter PSCC Canal diameter Limb length LSCC Bony island width Cochlea Basal turn width Basal turn height Upper turn width Upper turn height IAC Length * Opening width VA Coronal SSCC Bony island width Canal diameter LSCC Bony island width Canal diameter Cochlea Height IAC Length * * Opening width The data was compared by t-test accoring to sex. the only significant dimension is the length of IAC on coronal viewp0.022 but all other dimensions had no significant difference. SSCC superior semicircular canal, PSCCposterior semicircular canal, LSCClateral semicircular canal, IACinternal auditory canal, VAvestibular aqueduct Table 3. Difference according to bone conduction threshold Scan Structure Measuremnt BC 10 db n32 MeanSDmm BC10 db n11 Axial SSCC Canal diameter Bony island width Ampulla diameter PSCC Canal diameter Limb length LSCC Bony island width Cochlea Basal turn width Basal turn height Upper turn width * * Upper turn height IAC Length Opening width VA Coronal SSCC Bony island width Canal diameter LSCC Bony island width Canal diameter Cochlea Height IAC Length Opening width BCbone conduction threshold. p0.031, p= Korean J Otolaryngol 2004;47:827-32

5 고의경외 Table 4. Difference according to sides Scan Structure Measuremnt MeanSD mm Lt n=21 Rt n=22 Axial SSCC Canal diameter Bony island width Ampulla diameter PSCC Canal diameter Limb length LSCC Bony island width Cochlea Basal turn width Basal turn height Upper turn width Upper turn height IAC Length Opening width VA Coronal SSCC Bony island width Canal diameter LSCC Bony island width Canal diameter Cochlea Height IAC Length Opening width * * p

6 정상내이구조물의계측 REFERENCES 1) Nam SI, Goh EK, Lee CH, Koo SK, Lee SH, Chon KM. Computed tomographic study of the temporal bone of chronic otitis media patients. Korean J Otoloaryngol 1999;42: ) Koo GJ, Goh EK, Yun JH, Lee CH, Lee SH, Chon KM. Computed tomographic measurements of the external auditory canal and the temporal bone. Korean J Otoloaryngol 2002;45: ) Shin JA, Cho YB, Ahn OS. A study on the position of the mastoid antrum of korean people in the temporal bone CT. Korean J Otoloaryngol 1999;42: ) Fatterpekar GM, Mukherji SK, Alley J, Lin Y, Castilo M. Hypoplasia of the bony canal for the cochlear nerve in patients with congenital sensorineural hearing loss: Initial observations. Radiology 2000;215: ) Fatterpekar GM, Mukherji SK, Kin Y, Alley JG, Stone JA, Castillo M. Normal canals at the fundus of the internal auditory canal: CT evaluation. J Comput Assist Tomogr 1999;23: ) Tanioka H, Kaga H, Zusho H, Araki T, Sasaki Y. MR of the endolymphatic duct and sac: Findings in Meniere disease. Am J Neuroradiol 1997;18: ) Schmalbrock P, Dailiana T, Chakeres DW, Oehler MC, Welling DB, Williams PM, et al. Submillimeter-resolution MR of the endolymphatic sac in healthy subjects and patients with Meniere disease. Am J Neuroradiol 1996;17: ) Purcell D, Johnson J, Fischbein N, Lalwani AK. Establishment of normative cochlear and vestibular measurements to aid in the diagnosis of inner ear malformations. Otolaryngol Head Neck Surg 2003;128: ) Lee SW, Lee HK, Kim CJ, Kim YJ, Chung JW, Lee KS. Analysis of inner ear abnormalities using temporal bone computed tomography in profound hearing loss patients. Korean J Otoloaryngol 2002;45: ) Nam BH, Kim YM, Kim TH. Lateral semicircular canal dysplasia in middel ear cholesteatoma patients. Korean J Otoloaryngol 2002; 45: ) Jackler RK, Luxford WM, House WF. Congenital malformations of the inner ear: A classification based on embryogenesis. Laryngoscope 1987;97: ) Mafee MF, Selis JE, Yannias DA, Valvassori GE, Pruzansky S, Applebaum EL, et al. Congenital sensorineural hearing loss. Radiology 1984;150: ) Sando I, Takahara T, Ogawa A. Congenital anomalies of the inner ear. Ann Otol Rhinol Laryngol 1984;112: ) Phelps PD. congenital lesions of the inner ear, demonstrated by tomography. Arch Otolaryngol 1974;100: ) Pappas DB, Simpson LC, McKenzie RA, Royal S. High-resolution computed tomography: Determination of the cause of pediatric sensorineural hearing loss. Laryngoscope 1990;100: Korean J Otolaryngol 2004;47:827-32

골화범위의 측정 Fig. 1. Schematic illustration for division of thyroid lamina and calculation of ossification height in thyroid cartilage. Ossification heigh

골화범위의 측정 Fig. 1. Schematic illustration for division of thyroid lamina and calculation of ossification height in thyroid cartilage. Ossification heigh KISEP Head and Neck Korean J Otolaryngol 2000;43:1241-6 후두 전산화단층촬영을 이용한 정상성인의 후두연골 골화에 관한 연구 박형진 공수근 서철주 김기태 이일우 이병주 노환중 고의경 전경명 왕수건 Ossification Patterns of Laryngeal Cartilage Using CT Scan Hyoung-Jin