To examine human body for abnormalities, X-ray examination is widely used in the world. At a sufficient dose a high quality medical image can be derived, and will result in the early identification of illness or disease. As a result, exposure dose to patients has increased according to irradiation of intensity X-rays [1]. The exposure may be the cause of various cancers, therefore a proper balance between the image quality and exposure to the patient (patient exposure) should be considered [2]. Therefore, it is important...

In our experiment, we used a soft-tissue equivalent phantom (Kyoto Kagaku Co., Ltd., Kyoto, Japan) instead of the human body. X-rays generated by diagnostic X-ray equipment (TOSHIBA Medical Systems Corporation, Nasu, Japan) were detected with a CdTe detector (EMF Japan Co., Ltd., Osaka, Japan). We measured the spectra under two experimental conditions as shown in Fig. 5; (a) indicated that X-rays penetrate both the phantom and nanoDot OSL dosimeter (Landauer Corporation, Illinois, USA) attached to the front of the phantom, (b) is phantom only. The...

In Fig.8, upper figures show the example of obtained spectra which were measured under the following irradiation conditions: the tube voltage is 60 kV, the phantom thickness is 12 cm and the tube current-time products are 10 and 200 mAs. The horizontal axis shows the photon energy, and the vertical axis shows the number of photons. The spectra indicated by blue and red lines are obtained by experiments (a) and (b) in Fig.5, respectively. Here, our analyzing method was applied to these spectra, and results...

In the present study, we newly proposed a quantitative identification method to determine whether the nanoDot OSL dosimeter can be identified on the medical image. In this method, an X-ray spectrum was measured with a CdTe detector, and the analysis was performed from the perspective of substance identification. Then, we verified the identification limit of the nanoDot OSL dosimeter for the clinical application. As a result, we found that the nanoDot OSL dosimeter can’t be identified under certain irradiation conditions. Moreover, the general irradiation conditions...

[1] Uffmann M, Prokop CS. Digital radiography: The balance between image quality and required radiation dose. European Journal of radiology. 2009;72:202-208. [2] Uffmann M, Prokop CS. Digital radiography: The balance between image quality and required radiation dose. European Journal of Radiology. 2009;72:202-208. [3] Komiya I, Shirasaka T, Umezu Y, Tachibana M, Izumi. Patient Dose Measurement with Fluorescent Glass Dosimeter: Characteristics Evaluation and Patient Skin Dose Measurement in Abdominal Interventional Radiology. Japanese Journal of Radiological Technology. 2003;60(2):270-277 (in Japanese). [4] Shortt CP, Malone L, Thornton J,...