Knowledge of coronary artery variations and pathologies is important in planning the treatment and in interpretation of findings of cardiovascular diseases. Our study indicated that, although right dominance circulation is more common in general population, both the coronary diseases and coronary artery variations are more common in individuals with left dominance circulation.

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The purpose of this article is to provide an up to date review on the spectrum of applications of perfusion computed tomography (CT) in the abdomen. New imaging techniques have been developed with the objective of obtaining a structural and functional analysis of different organs. Recently, perfusion CT has aroused the interest of many researchers who are studying the applicability of imaging modalities in the evaluation of abdominal organs and diseases. Per-fusion CT enables fast, non-invasive imaging of the tumor vascular physiology. Moreover, it can act as an in vivo biomarker of tumor-related angiogenesis.

Interrupted aortic arch is a rare congenital malformation of the aortic arch defined as a loss of luminal continuity between the ascending and descending portions of the aorta. In a simple interrupted aortic arch, only a ventricular septal defect and patent ductus arteriosus are observed. We present a rare complex form of type A interrupted aorta with an aortopulmonary window, an atrial septal defect, a ventricular septal defect, and a patent ductus arteriosus on multidetector computed tomography (MDCT) imaging.Key Words: Aortic interruption, Aortopulmonary window, Multidetector computed tomography ÖzetKesintili arkus aorta, çıkan ve inen aorta arasındaki lümen sürekliliği kaybı olarak tanımlanan nadir bir konjenital anomalidir. Basit kesintili arkus aortada sadece ventriküler septal defekt ve patent duktus arteriozus görülür. Aortopulmoner pencere, atrial septal defekt, ventrikü-ler septal defekt ve patent duktus arteriozus ile birlikte tip A kesintili arkus aortanın nadir bir kompleks formu olgusunun multidedektör bilgisayarlı tomografi bulguları sunulmuştur.

Objective: Our aim in this study was to determine the relationship between chest circumference and the radiation doses received by breast tissues during Dual-Source Computed Tomography (DSCT) cardiac scans. Materials and Methods:Routine cardiac DSCT examinations with similar exposure lengths were applied to 30 female patients. The scanogram image, multi-slice helical scan x-ray tube voltage and anode-cathode current were adjusted automatically according to attenuation for each patient during the scanogram acquisition. The standard protocol was otherwise applied to all patients. The 30 patients had an average weight of 67.8±15.3 kg, and the average length of the scanned region was 278.0±11.6 mm. Radiation doses were calculated from the dose-length product (DLP) and the computed tomography dose index (CTDI) scanner data values. The correlations between radiation dose and chest circumference were investigated. The level of significance was set at p<0.05. Results:For routine cardiac DSCT scans, the average values were as follows: total DLP: 715.54±317.01 mGycm, CTDIvol: 40.79±19.41 mGy, and effective dose (ED): 17.89±7.93 mSv. The chest circumference of patients correlates well with their radiation exposure (p<0.01). Conclusion:The distribution of different tissues throughout the human body may vary among races and genders. Because of this, many researchers use body mass index (BMI) to set image quality and predict the radiation dose distribution from general computed tomography (CT) examinations. Additional anthropomorphic phantom studies should be conducted to determine more accurate conversion factors and, hence, better ED predictions.Key Words: Breast, Cardiac, DSCT, Radiation dose Özet Amaç: Bu çalışmadaki amacımız göğüs çevresi ve Dual-Source Bilgisayarlı Tomografi (DSCT) kardiyak taramaları sırasında meme dokusu tarafından alınan radyasyon dozları arasındaki ilişkiyi belirlemektir. Gereç ve Yöntem:Benzer tarama uzunluklarına sahip rutin kardiyak DSCT incelemeler 30 kadın hastaya uygulandı. Spot görüntü, çok kesitli helikal tarama x-ışını tüpü gerilim ve anot-katot akımı spot gö-rüntü alınması sırasında belirlenerek her hasta için azaltma miktarına göre otomatik olarak ayarlandı. Aksi belirtilmedikçe standart protokol tüm hastalara uygulandı. 30 hastanın, ortalama ağırlığı 67.8±15.3 kg'dı ve taranan bölgenin ortalama uzunluğu 278.0±11.6 mm idi. Radyasyon dozları doz uzunluk çarpımı (DLP) ve bilgisayarlı tomografi doz indeksi (CTDI) tarayıcı verilerinden hesaplandı. Radyasyon dozu ve göğüs çevresi uzunluğu arasındaki ilişki araştırıldı. Anlamlılık düzeyi p<0.05 olarak tespit edildi. Sonuç: İnsan vücudu boyunca farklı dokuların dağılımı ırklar ve cinsiyetler arasında farklılık gösterebilmektedir. Bu sebeple, birçok araştırmacı görüntü kalitesini ayarlayabilmek ve genel bilgisayarlı tomografi (BT) incelemelerinde soğrulan radyasyon doz dağılımını tahmin etmek için vücut kitle indeksini (BMI) kullanmaktadır. Daha iyi ED tahminleri ve daha doğru dönüşüm faktörleri belirlemek amacıyla ek antropomorfik fantom...