A popular phantom in photoacoustic imaging is poly(vinyl alcohol) (PVA) hydrogel fabricated by freezing and thawing (F-T) aqueous solutions of PVA. The material possesses acoustic and optical properties similar to those of tissue. Earlier work characterized PVA gels in small test specimens where temperature distributions during F-T are relatively homogeneous. In this work, in breast-sized sampl...

Mammography is the safest method of detecting breast cancer but, at the same time, the most exacting radiological examination which implies getting high quality images and a minimum dose per breast. The present study was carried out in six mammography laboratories, from which only one has partially implemented a programme of quality control. There were evaluated the phantom image, film contrast...

objectives: the aim of this study was to verify the treatment planning systems (tpss). the next aim was to validate imsure qa software for patient-specific qa in radiotherapy clinics.  material and methods: we used imsure qa software (standard imaging, v 3.5) for verification of 92 non-imrt plans (540 fields) in 10 radiotherapy clinics. to validate the imsure, dose measurement was performed in ...

BACKGROUND Different methods of image quality evaluation are routinely used for analogue and digital mammography systems in Poland. In the present study, image quality for several screen-film (SF), computed radiography (CR), and fully digital (DR) mammography systems was compared directly with the use of the ACR mammography accreditation phantom. MATERIAL/METHODS Image quality and mean glandu...

In this paper, the Monte Carlo simulation was used to simulate the diffuse reflectance of four breast tissues, which includes the normal breast tissue and three diseased human breast tissues (the breast fibroadenoma, the mastopathy and the breast cancer). The simulation was made in the wavelength of 633nm. To verify the simulations, experiments were done to measure the diffuse reflectance. The ...

High-resolution breast imaging may improve differentiation between benign and malignant lesions and may be important for refining treatment strategy. This article presents a new, flexible design of a breast-imaging coil capable of providing breast images of a high level of spatial resolution. Referred to as a switchable coil array, the design uses small-diameter surface coils that provide high ...