Journals / Okmeydanı Tıp Dergisi / 2012 / Cilt: 28 - Sayı: 1

The contribution of diffusion weighted magnetic resonance imaging to the diagnosis of prostate malignencies

Prostat malignitelerinde difüzyon ağırlıklı MR'ın tanıya katkısı

Pages
18–24
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

New studies with large patient and control groups will emphasize the value of MRI with DWI in the diagnosis of prostate cancer.

📌 3 Key Takeaways

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Objective & Hypothesis:Objective: We aimed to analyse the contribution of diffusion weighted imaging (DWI) with the use of apparent diffusion coefficient (ADC) values in order to distinguish benign and malignant prostate lesions.
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Key Findings & Data:Material and Methods: A total of 55 patients referred to Clinics of Radiology of Okmeydanı Research and Trainin Hospital from Urology Clinics of the same hospital after digital rectal examination and determination of serum prostate-spesific antigen (PSA) values were included in the study.
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Conclusion & Impact:New studies with large patient and control groups will emphasize the value of MRI with DWI in the diagnosis of prostate cancer.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

Objective: We aimed to analyse the contribution of diffusion weighted imaging (DWI) with the use of apparent diffusion coefficient (ADC) values in order to distinguish benign and malignant prostate lesions. Material and Methods: A total of 55 patients referred to Clinics of Radiology of Okmeydanı Research and Trainin Hospital from Urology Clinics of the same hospital after digital rectal examination and determination of serum prostate-spesific antigen (PSA) values were included in the study. Priorly, magnetic resonance imaging (MRI) was performed with 1.5 T system (Philips Philips Achieva Netherlands 1.5 Tesla) before TRUS- guided prostate biopsy. Axial T1A, T2A, fat suppressed coronal and sagittal T2A; prostate centered axial T1A, fat suppressed T2A,coronal and sagittal images were obtained. In addition to conventional sequences, diffusion weighted magnetic resonance sequences were applied. DWI and ADC mapping were obtained with 3 different b values (b=0, b=600, b=1000sn/mm²). Diffusion sensitive gradients were applied with single shot echo-planar spin echo at 1.5 Tesla magnetic resonance component on axial plan. MRI images were revaluated retrospectively based on histopathological results. Results: According to histopathological results of TRUS - guided prostate biopsies applied on all 55 patients, malignant, and benign lesions were detected in 15, and 40 patients, respectively. Peripheral zone of malignant tissue demonstrated hypointensity on T2A sequences, and hyperintensity on diffusion weighted MRI sequences with lower values in ADC maps. Mean ADC values were 0.930mm²/sec for malignant, and 1.500 mm²/sec for benign tissues. Mean ADC value of benign tissues was found to be higher than that of the malignant tissue (p<0.001). Conclusion: Remarkable results have been found to distinguish benign and malign prostate lesions by using diffusion weighted magnetic resonance scanning and quantitative ADC measurement in accordance with published relevant studies. In other words T2A images of malign prostate tissue were relatively more hypointense, while in DWI they were more hyperintense because of restricted diffusion with marked signal loss in ADC mapping sequences. New studies with large patient and control groups will emphasize the value of MRI with DWI in the diagnosis of prostate cancer.

Özet

Amaç: Benign-malign prostat lezyonlarının ayrımında difüzyon ağırlıklı (DAG) Manyetik Rezonans görüntüleme (MRG) ile görünen difüzyon katsayı (ADC) değerlerinin ölçülmesi ve tanıya katkısının araştırılması amaçlanmıştır. Gereç ve Yöntem: Bu çalışmaya Okmeydanı Eğitim Araştırma Hastanesi Üroloji Kliniği’nden rektal muayene sonrası ve prostat spesifik antijen (PSA) değerleri ile doku örneklemesi için Radyoloji Kliniği’ne gönderilen 55 hasta dahil edildi. Hastalara önce 1.5 Tesla (Philips Philips Achieva Netherlands 1,5 Tesla) cihazla pelvise yönelik aksiyel T1A, T2A, yağ baskılı koronal ve sagittal T2A; prostata yönelik aksiyel T1A, T2A, koronal ve sagittal T2A yağ baskılı kesitler, aksiyel 3 farklı b değerinde (b:0, b:600, b:1000sn/mm2) single shot echo-planar spin eko ile DAG ve ADC haritaları alındı. Daha sonra transrektal ultrasonografi (TRUS) ve TRUS eşliğinde biyopsi yapıldı. Patoloji sonuçlarına göre MR görüntüleri retrospektif olarak incelendi. Bulgular: Ultrasonografi (US) eşliğinde tru-cut biyopsi yapılan 55 hastanın patoloji sonuçlarına göre 15 hastada malign, 40 hastada benign bulgular saptandı. Malign doku periferik zonda T2A sekanslarda hipointens, difüzyon ağırlıklı görüntülemede hiperintens izlenirken, ADC haritalarında düşük değerlere sahip olarak izlendi. ADC ölçümleri sonucunda malign dokudaki ortalama ADC değeri 0.930mm²/sn, benign dokudaki ADC değeri 1.500 mm²/sn olarak ölçülmüş olup, benign lezyonların ortalama ADC değeri malign lezyonlardakinden anlamlı ölçüde yüksek olarak bulundu (p<0.001). Sonuç: Bu çalışmada literatürlerdeki diğer çalışmalar ile uyumlu olarak prostat malignitelerinde malign doku T2A görüntülerde hipointens, normal prostat dokusuna göre DAG’de difüzyon kısıtlanmasına bağlı yüksek sinyalli, ADC haritalarında ise belirgin sinyal kaybı ile karekterize olup, daha geniş hasta popülasyonu ile yapılacak çalısmalar MRG’nin ve DAG’nin prostat kanseri tanısındaki rolünü daha belirgin bir konuma getirebilir.

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Cite This Article

DÖNMEZ, E., COŞKUN, Z. Ü., YAKUT, S., DEĞERMENCİ, H. (2012). The contribution of diffusion weighted magnetic resonance imaging to the diagnosis of prostate malignencies. Okmeydanı Tıp Dergisi, Cilt: 28 - Sayı: 1, 18–24. https://ajindex.com/articles/291862

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