AYŞEGÜL YURT, Nilsu CİNİ, Aliye Sezen OKTAY, PINAR BALCI

Dijital Mamografide farklı meme yoğunluklarında doz ve görüntü kalitesi arasındaki ilişkinin değerlendirilmesi

Amaç: Bu çalışmada, Dijital Mamografi (DM)’de memenin glandüler yapısına bağlı olarak her bir uygulamadaki ortalama glandüler doz değeri ile görüntü kalitesi arasındaki ilişkinin değerlendirilmesi amaçlanmıştır. Gereç ve Yöntem: Retrospektif olarak gerçekleştirilen çalışmada hastaların sağ ve sol meme CranioCaudal (sırasıyla RCC ve LCC) ve MedioLateralOblik (sırasıyla RMLO ve LMLO) iki boyutlu (2B) ve üç boyutlu (3B) tomosentez görüntü verileri incelendi ve meme görüntüleme raporlama ve veri sistemi (Breast Imaging Reporting and Data System- BI-RADS) kriterlerine göre meme yapısı A, B, C ve D olarak sınıflandırıldı. Çalışmaya başlamadan önce cihazın verdiği doz değerlerini doğrulamak amacıyla DM Tomosentez cihazının dozla ilgili kalite kontrol çalışmaları gerçekleştirildi. Cilt giriş dozu (CGD), ortalama glandüler doz (OGD) ve sinyal gürültü oranı (Signal Noise Ratio- SNR) değerleri belirlendi ve hastaya verilen doz ve görüntü kalitesi arasındaki ilişkinin sayısal olarak değerlendirmek için Figure of Merit (FOM) hesaplandı. Grupların istatistiksel analizleri SPSS 15 programı kullanılarak parametrik gruplarda Pearson korelasyonu anlamlılık değeri p hesaplandı ve p<0,05 olarak alındı. Bulgular: 3B tomosentez incelemesinde B ve C tipi memenin RMLO, LMLO, sağ ve sol meme MedioLateralOblik Combo (sırasıyla RMLOc ve LMLOc) pozisyonları, 2B mamografide çoğunluğu oluşturan grup A tipi memenin RCC, LCC, RMLO, LMLO pozisyonları ayrı ayrı değerlendirildi ve her çekim pozisyonunda OGD-FOM ve SNR-FOM arasında anlamlı bir korelasyon (p<0,05) bulundu. Sonuç: Meme glandüler yapısına göre, doz ve görüntü kalitesi arasında güçlü bir korelasyon olması memenin aldığı doza karşılık elde edilen görüntü kalitesinin optimum şartlarda olduğunu göstermektedir.

Anahtar Kelimeler:

Tomosentez, FOM, Ortalama Glandüler Doz, görüntü kalitesi, dijital mamografi

EVALUATION OF THE RELATION BETWEEN DOSE AND IMAGE QUALITY AT DIFFERENT BREAST DENSITIES IN DIGITAL MAMMOGRAPHY

Objective: The aim of this study was to evaluate the relation between image quality and mean glandular dose (MGD) value in each application in Digital Mammography (DM) depending on the glandular structure of the breast. Material and Method: In this retrospective study, right and left breast CranioCaudal (RCC and LCC, respectively) and Medio Lateral Oblique (RMLO and LMLO, respectively) two-dimensional (2D) and three-dimensional (3D) tomosynthesis image data of the patients' were examined and the breast structure was classified as A, B, C and D according to Breast Imaging Reporting and Data System(BI-RADS) criteria. Firstly, the dose-related quality control evaluations of the DM tomosynthesis system were performed to confirm the dose values given by devices. Skin entrance dose (SED), mean glandular dose (MGD) and Signal Noise Ratio (SNR) values were determined and Figure of Merit (FOM) was calculated to quantitatively assess the relation between the dose given to the patient and image quality. Statistical analysis of the groups was performed by using SPSS 15 program and Pearson correlation significance value was calculated as p <0.05 for parametric groups. Results: In the 3D tomosynthesis examination, the RMLO, LMLO, right and left breast Medio Lateral Oblique Combo (RMLOc and LMLOc, respectively) positions of the B and C breasts, and the RCC, LCC, RMLO, LMLO positions of the group A type breast, which constituted the majority in 2D mammography were evaluated separately and a significant correlation (p <0.05) was found between MGD-FOM and SNR-FOM in each position. Conclusion: According to the breast glandular structure, a strong correlation between dose and image quality indicates that the image quality obtained under the given dose is in optimum conditions

Keywords:

Tomosynthesis, FOM, Average Glandular Dose, Image Quality, Digital Mammography,

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