Effect of radiation dose on the prevalence of apical periodontitis--a dosimetric analysis.

Objectives: The objective of this study is to analyse the effect of the radiation dose of oral radiotherapy for cancer on the presence of apical periodontitis in patients without dental pre-screening or specific preventive measures.

Materials And Methods: All selected patients had been diagnosed with cancer in the head and neck region and presented in the dental clinic post radiotherapy with side effects (mainly radiation caries). The panoramic radiographs of these patients were examined for several parameters, including tooth decay and apical periodontitis.

Intensity-modulated radiation therapy for prostate cancer: late morbidity and results on biochemical control.

Purpose: To report on late morbidity and biochemical relapse-free survival (bRFS) after intensity-modulated radiation therapy (IMRT) for prostate cancer.

Methods: Between 1998 and 2005 133 patients were treated with IMRT for T(1-4) N0 M0 prostate cancer. The median follow-up time was 36 months.

Magnetic resonance imaging anatomy of the prostate and periprostatic area: a guide for radiotherapists.

Magnetic resonance imaging (MRI) offers superb soft tissue contrast on T2-weighted images and allows direct multiplanar image acquisition. It can show the internal prostatic anatomy, prostatic margins, and the extent of prostatic tumors in much more detail than computed tomography (CT) images. The present article reviews some key prostatic and periprostatic radiologic landmarks that can be helpful for the radiotherapist using T2-weighted MRI as an adjunct to CT in treatment planning for prostate cancer.

Interobserver delineation variation using CT versus combined CT + MRI in intensity-modulated radiotherapy for prostate cancer.

Purpose: To quantify interobserver variation of prostate and seminal vesicle delineations using CT only versus CT + MRI in consensus reading with a radiologist.

Material And Methods: The prostate and seminal vesicles of 13 patients treated with intensity-modulated radiotherapy for prostatic adenocarcinoma were retrospectively delineated by three radiation oncologists on CT only and on CT + MRI in consensus reading with a radiologist. The volumes and margin positions were calculated and intermodality and interobserver variations were assessed for the clinical target volume (CTV), seminal vesicles, prostate and three prostatic subdivisions (apical, middle and basal third).

Magnetic resonance assessment of prostate localization variability in intensity-modulated radiotherapy for prostate cancer.

Purpose: To measure prostate motion with magnetic resonance imaging (MRI) during a course of intensity-modulated radiotherapy.

Methods And Materials: Seven patients with prostate carcinoma were scanned supine on a 1.5-Tesla MRI system with weekly pretreatment and on-treatment HASTE T2-weighted images in 3 orthogonal planes.

The incidence of inclusion of the sigmoid colon and small bowel in the planning target volume in radiotherapy for prostate cancer.

Background And Purpose: In radiotherapy for prostate cancer, the rectum is considered the dose-limiting organ. The incidence of overlap between the sigmoid colon and/or small bowel and the planning target volume (PTV) as well as the dose to sigmoid colon and small bowel were investigated.

Patients And Methods: The CT data of 75 prostate cancer patients were analyzed.