Aim: Implementation and validation of an automatic registration method based on mutual information (MI) for the integration of thoracic and abdominal positron emission tomography (PET)/computed tomography (CT) studies, with the purpose to facilitate in a clinical context the inclusion of PET metabolic information in conformal radiotherapy (RT).

Methods: Registration was obtained by modeling a rigid spatial transformation between CT and PET transmission studies. The registration method was based on Normalized Mutual Information (NMI), by iteratively transforming the PET volume, until its optimal alignment to the CT study is achieved, in correspondence of the maximum of NMI. To avoid entrapment in local maxima and to improve convergence speed we introduced a multiresolution scheme. Accuracy of the proposed approach was investigated in experimental data, relative to phantom and patient studies, acquired in conditions similar to clinical situations.

Results: In phantom studies the mean error in the 3D space is 3.6 mm (range 3-4 mm) in thoracic region and 3.2 mm (range 2.9-3.7 mm) in abdominal region, considerably less than PET spatial resolution. In patient studies the spatial mean error increases with respect to phantom studies (5.4 mm and 5.2 mm for thorax and abdomen, respectively) but remains comparable to the PET spatial resolution. The accuracy of spatial realignment was thus found adequate for the registration of PET/CT registration, if good patient repositioning was adopted.

Conclusions: The proposed registration method, based on MI, was validated for the integration of PET/CT studies of patients candidate for thoracic and abdominal conformal RT. The method is automatic and provided with a user interface, thus suitable for clinical use.

Download full-text PDF

Source

Publication Analysis

Top Keywords

thoracic abdominal
12
registration method
12
method based
12
automatic registration
8
studies
8
abdominal conformal
8
conformal radiotherapy
8
patient studies
8
phantom studies
8
pet spatial
8

Similar Publications

Development and Validation of a Minimally Invasive Transuterine Experimental Model of Gastroschisis.

J Pediatr Surg

January 2025

The Center for Fetal and Placental Research, Division of Pediatric General and Thoracic Surgery, Cincinnati Children's Hospital Medical Center (CCHMC), 3333 Burnet Avenue, Cincinnati, OH 45229, USA; Division of Pediatric General and Thoracic Surgery, Cincinnati Children's Hospital Medical Center (CCHMC), 3333 Burnet Avenue, Cincinnati, OH 45229, USA; University of Cincinnati College of Medicine, 3230 Eden Ave, Cincinnati, OH 45267, USA. Electronic address:

Introduction: Perinatal management of gastroschisis remains a subject of substantial research. Current models, including teratogenic, genetic, and surgical approaches, often fail to accurately replicate gastroschisis, exhibiting limitations such as inaccurate phenotyping, low success rates, high mortality, lack of scientific validation, and significant technical challenges. Refined disease models are essential for improving the understanding of GS.

View Article and Find Full Text PDF

The optimal management of acute type A aortic dissection (ATAAD) remains a controversial subject. While some surgeons opt for a hemiarch approach to minimize bypass and cross-clamping time, others prefer partial or total arch replacement to prevent the need for additional operations. The advent of hybrid approaches offers a variety of options to the aortic surgeon in treating ATAAD.

View Article and Find Full Text PDF

Purpose: Our aim was to update evidence-based and consensus-based recommendations for the inhospital endovascular management of haemorrhage and vascular lesions in patients with multiple and/or severe injuries based on current evidence. This guideline topic is part of the 2022 update of the German Guideline on the Treatment of Patients with Multiple and/or Severe Injuries.

Methods: MEDLINE and Embase were systematically searched to June 2021.

View Article and Find Full Text PDF

Objectives: To analyze the presence of nutritional impact symptoms (NIS) throughout radiotherapy treatment in the head and neck, thorax, abdomen, and pelvis areas.

Methods: A prospective cohort study was conducted with individuals undergoing radiotherapy for cancer. Three assessments were carried out: at the start of radiotherapy, midway through, and in the last week of treatment.

View Article and Find Full Text PDF

Aortic dilatation is a severe pathology that increases the risk of rupture and its hemodynamics could be accurately assessed by using the 4D flow cardiovascular magnetic resonance (CMR) technique but flow assessment under complex flow patterns require validation. The aim of this work was to develop an in vitro system compatible with CMR to assess the accuracy of volume flow measurements in dilated aortas. Approach.

View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!