Dosimetry and prescription in liver radioembolization with Y microspheres: 3D calculation of tumor-to-liver ratio from global Tc-MAA SPECT information.

Dosimetry in liver radioembolization with Y microspheres is a fundamental tool, both for the optimization of each treatment and for improving knowledge of the treatment effects in the tissues. Different options are available for estimating the administered activity and the tumor/organ dose, among them the so-called partition method. The key factor in the partition method is the tumor/normal tissue activity uptake ratio (T/N), which is obtained by a single-photon emission computed tomography (SPECT) scan during a pre-treatment simulation.

Ionizing radiation in patients with Crohn´s disease. Estimation and associated factors.

Introduction: exposure to ionizing radiation is associated with an increased risk of developing tumors. Patients with Crohn's disease (CD) usually require multiple imaging tests using this type of radiation.

Objectives: the objectives of this study were to estimate the total dose of ionizing radiation received by patients with Crohn's disease during their course and to identify the factors associated with higher radiation doses.

[Radiation exposure in children undergoing diagnostic imaging: a study of Pamplona County].

Objective: To describe a method of calculating and registering the dose of radiation used in Pamplona County in pediatric examinations, and to show the results obtained one year after its implementation.

Material And Methods: The effective dose was calculated by a program that uses the pediatric files of the United Kingdom's National Radiation Protection Board. This program, incorporated into the Computerized Clinical History, enables an Individual Dosimetric History to be calculated for the entire pediatric population.

Chemoradiotherapy for muscle invading bladder carcinoma. Final report of a single institutional organ-sparing program.

Purpose: Chemoradiotherapy is becoming an alternative to radical cystectomy among patients with muscle invading bladder cancer. We began a prospective study in 1988 to determine the possibilities of conservative treatment and aiming to improve the results obtained by cystectomy alone in invasive bladder cancer. A combination of methotrexate, vinblastine, adriamycin, and cisplatin (M-VAC), followed by radiotherapy and concomitant cisplatin was used.