abstract background: triple therapy with a proton pump inhibitor, clarithromycin and amoxicillin and quadruple therapy with a proton pump inhibitor, bismuth citrate, metronidazole and amoxicillin have been proposed in maastricht 2000 as the optimal treatment of helicobacter pylori infection. we aimed to compare these two regimens in iranian pediatric patients. methods: a randomized clinical tri...

Over the past 20 years, several proton beam treatment programs have been implemented throughout the United States. Increasingly, the number of new programs under development is growing. Proton beam therapy has the potential for improving tumor control and survival through dose escalation. It also has potential for reducing harm to normal organs through dose reduction. However, proton beam thera...

PURPOSE To describe the approval process for enrolling patients on NCI-funded cooperative group clinical trials with proton therapy and the impact of data obtained from the process. METHODS Institutions interested in participating in clinical trials with proton therapy must first complete five RPC-coordinated approval steps for each proton delivery Method: a) completion of the proton facility...

The physics of proton therapy has advanced considerably since it was proposed in 1946. Today analytical equations and numerical simulation methods are available to predict and characterize many aspects of proton therapy. This article reviews the basic aspects of the physics of proton therapy, including proton interaction mechanisms, proton transport calculations, the determination of dose from ...

Proton therapy is very sensitive to uncertainties introduced during treatment planning and dose delivery. PET imaging of proton induced positron emitter distributions is the only practical approach for in vivo, in situ verification of proton therapy. This article reviews the current status of proton therapy verification with PET imaging. The different data detecting systems (in-beam, in-room an...

Radiation dose escalation and acceleration improves local control but also increases toxicity. Proton radiation is an emerging therapy for localized cancers that is being sought with increasing frequency by patients. Compared with photon therapy, proton therapy spares more critical structures due to its unique physics. The physical properties of a proton beam make it ideal for clinical applicat...

Hadron therapy hospital centers have become wide spread in the world during the last decade. These centers were created mainly on basis of the cycling accelerators such as cyclotrons and synchrotrons. Now there are several proposals of the proton centers on the basis of linear accelerators. In this report we discuss features, advantages and disadvantages of hadron therapy centers on the basis o...

The potential benefits of proton therapy have been established in pediatric cancer, skull base tumor, uveal melanoma, and other types of cancers. Western and Asian countries, however, have differences in the pattern of cancer incidence; this leads to the difference in patient demographics for proton therapy. Furthermore, the advancement of the scanning beam technique in proton therapy greatly e...

background and objective: asthma is the most common chronic disease of childhood. the disease is caused by a temporary blockage of airflow due to chronic inflammation of the airways . one of the conditions that often occur with asthma and exacerbate disease, is gastroesophageal reflux. the aim of this study is to evaluate the role of acid suppressing therapy in patients with refractory asthma. ...