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Available online 10 March 2021
Ultralow-dose CT of the petrous bone using iterative reconstruction technique, tin filter and high resolution detectors allows an adequate assessment of the petrous bone structures
La tomografía computarizada de peñascos con dosis ultrabaja, utilizando filtro de estaño, detectores de alta resolución y reconstrucción iterativa, permite una adecuada valoración de las estructuras del peñasco
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M. Novoa Ferro
Corresponding author
, E. Santos Armentia, N. Silva Priegue, C. Jurado Basildo, C.A. Sepúlveda Villegas, C. Delgado Sánchez-Gracián
Servicio de Radiodiagnóstico, Hospital Povisa, Vigo, Pontevedra, Spain
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Tables (4)
Table 1. Comparative table of demographic data and reasons for requesting the studies in both groups.
Table 2. Summary table of the quantitative data for density, noise and signal-to-noise ratio for bone (compact and cancellous) and muscle in both CT machines.
Table 3. Comparative table of results.a
Table 4. Mean radiation dose measured in millisieverts, computed tomography dose index measured in milligrays and Dose-Length Product measured in mGy*cm, according to the equipment used (32-slice and 16-slice multidetector computed tomography respectively).
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Abstract
Objectives

To assess image quality and radiation dose in computed tomography (CT) studies of the petrous bone done with a scanner using a tin filter, high-resolution detectors, and iterative reconstruction, and to compare versus in studies done with another scanner without a tin filter using filtered back projection reconstruction.

Material and methods

Thirty two patients (group 1) were acquired with an ultra-low dose CT (32-MDCT, 130kV, tin filter and iterative reconstruction). Images and radiation doses were compared to 36 patients (group 2) acquired in a 16-MDCT (120kV and filtered back-projection). Muscle density, bone density, and background noise were measured. Signal-to-noise ratio (SNR) was calculated. To assess image quality, two independent radiologists subjectively evaluated the visualization of the different structures of the middle and inner ear (0=not visualized, 3=perfectly identified and delimited). Interobserver agreement was calculated. Effective dose at different anatomical levels with the dose-length product was recorded.

Results

In the quantitative analysis, there were no significant differences in image noise between the two groups. In the qualitative analysis, a similar or slightly lower subjective score was obtained in the delimitation of different structures of the ossicular chain and cochlea in the 32-MDCT, compared to 16-MDCT, with statistically significant differences. Mean effective dose (±standard deviation) was 0.16±0.04mSv for the 32-MDCT and 1.25±0.30mSv for the 16-MDCT.

Conclusions

The use of scanners with tin filters, high-resolution detectors, and iterative reconstruction allows to obtain images with adequate quality for the evaluation of the petrous bone structures with ultralow doses of radiation (0.16±0.04mSv).

Keywords:
Petrous bone
Temporal bone
Iterative reconstruction
Filter
Tin
High resolution
Resumen
Objetivos

Valorar la calidad de imagen y la dosis de radiación en tomografía computarizada (TC) de peñascos adquiridos con una TC multidetector (TCMD) con filtro de estaño, detectores de alta resolución y reconstrucción iterativa, comparándola con otro equipo sin filtro de estaño y con reconstrucción por retroproyección filtrada.

Material y métodos

Se incluyeron retrospectivamente 32 pacientes con TC de peñascos, realizadas con dosis ultrabaja en una 32-TCMD (130kV con filtro de estaño y reconstrucción iterativa). Se compararon con 36 estudios realizados en una 16-TCMD (120kV y retroproyección filtrada). Se cuantificó la densidad muscular, ósea y el ruido de fondo, y se calculó la relación señal/ruido. Para valorar la calidad de imagen, dos radiólogos evaluaron de forma subjetiva e independiente la visualización de las diferentes estructuras del oído (0=no se visualiza; 3=se identifica y delimita perfectamente). Se calculó el coeficiente de concordancia interobservador kappa. Utilizando un software comercial, se cuantificó a diferentes niveles anatómicos la dosis efectiva con el producto dosis-longitud.

Resultados

En el análisis cuantitativo de las imágenes no se observaron diferencias significativas en el ruido de fondo. En el análisis cualitativo se obtuvo una puntuación subjetiva similar o ligeramente menor en la delimitación de las diferentes estructuras de la cadena osicular y cóclea en la 32-TCMD, con diferencias estadísticamente significativas. La dosis media efectiva fue de 0,16±0,04 mSv para la 32-TCMD frente a 1,25±0,30 mSv para la 16-TCMD.

Conclusiones

La utilización de equipos con filtro de estaño, detectores de alta resolución y reconstrucción iterativa permiten obtener TC con dosis de radiación ultrabaja (0,16±0,04 mSv) con una calidad de imagen adecuada para valorar las estructuras de los peñascos.

Palabras clave:
Peñasco
Hueso temporal
Iterativa
Filtro
Estaño
Alta resolución

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