scholarly journals Cone beam computed tomography (CBCT) guidance is helpful in reducing dose exposure to pediatric patients undergoing radiofrequency ablation of osteoid osteoma

2021 ◽  
Author(s):  
Francesco Fiore ◽  
Francesco Somma ◽  
Roberto D’Angelo ◽  
Luca Tarotto ◽  
Vincenzo Stoia
Keyword(s):  
Computed Tomography ◽  
Radiofrequency Ablation ◽  
Pediatric Patients ◽  
Clinical Success ◽  
Cone Beam ◽  
Ct Guidance ◽  
Technical Success ◽  
Duration Time ◽  
Procedure Duration ◽  
Conventional Ct

Abstract Purpose To assess efficacy and safety of cone beam computed tomography (CBCT) in the radiofrequency ablation (RFA) of osteoid osteoma (OO) in children and adolescents, and to compare technical success, clinical success, radiation dose and procedure duration time of CBCT guidance to conventional computed tomography (CT) guidance. Materials and methods Between 2015 and 2019, 53 consecutive percutaneous RFA were performed on pediatric patients with CBCT or conventional CT guidance, respectively, in 24 and 29 children and adolescents with 24-month follow-up. Dose area product (DAP) and dose length product (DLP) were recorded, respectively, for CBCT and conventional CT and converted to effective doses (ED). Results CBCT and conventional CT groups were similar in terms of patient age and weight, tumor size and tumor location. Technical success was achieved in all cases. Primary clinical success was 91.67% (22/24) for the CBCT group and 89.66% (26/29) for the conventional CT group. Mean DAP was 64.75Gycm2 (range 6.0–266.7). Mean DLP was 972.62mGycm (range 337–2344). ED was significantly lower in the CBCT group compared to the conventional CT group (0.34 mSv vs. 5.53 mSv, p = 0.0119). Procedure duration time was not significantly longer in the CBCT group (102.25 min vs. 92.34 min, p = 0.065). No major complication was registered. Minor complications were observed in 4 patients (2 in CBCT; 2 in conventional CT). Conclusions Compared to conventional CT guidance, CBCT guidance for percutaneous OO ablation shows similar technical and clinical success rates, with reduced radiation dose and equivalent procedure duration time. This technique helps sparing dose exposure to pediatric patients.

scholarly journals Role of percutaneous computed tomography-guided radiofrequency ablation in treatment of osteoid osteoma

2017 ◽  
Vol 06 (04) ◽  
pp. 139-140 ◽  
Author(s):  
Ajay R. Upadhyay ◽  
Nikunj Chandrakant Desai ◽  
Digish U. Vaghela
Keyword(s):  
Computed Tomography ◽  
Radiofrequency Ablation ◽  
Success Rate ◽  
Osteoid Osteoma ◽  
Clinical Success ◽  
Tertiary Care ◽  
Ct Guidance ◽  
Western India ◽  
Ct Guided

Abstract Aim: The aim of the study was to evaluate efficacy of percutaneous computed tomography (CT)-guided radiofrequency ablation (RFA) of nidus in osteoid osteoma (OO). Materials and Methods: RFA was performed on fifty patients with clinically and radiologically diagnosed OO. RFA was done in the department of radio-diagnosis in our institute (a tertiary care providing institute in Ahmedabad, Western India). Ablation was performed by putting at an electrode tip (3–5 mm) into nidus under CT guidance with targeted temperature of 90°C for 3 min. Results: All procedures were technically successful. No immediate major or minor complications were observed. Complete clinical success was achieved in 46 patients. Only four patients required second intervention. Conclusion: Our experience indicates a 98% success rate. No major complications were noted.

scholarly journals Computed Tomography-Navigation™ Electromagnetic System Compared to Conventional Computed Tomography Guidance for Percutaneous Lung Biopsy: A Single-Center Experience

Diagnostics ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1532
Author(s):  
Morgane Lanouzière ◽  
Olivier Varbédian ◽  
Olivier Chevallier ◽  
Loïc Griviau ◽  
Kévin Guillen ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Study Data ◽  
Success Rates ◽  
Single Center ◽  
Dose Length Product ◽  
Electromagnetic System ◽  
Significant Difference ◽  
Procedure Duration ◽  
Conventional Ct ◽  
Total Procedure

The aim of our study was to assess the efficacy of a computed tomography (CT)-Navigation™ electromagnetic system compared to conventional CT methods for percutaneous lung biopsies (PLB). In this single-center retrospective study, data of a CT-Navigation™ system guided PLB (NAV-group) and conventional CT PLB (CT-group) performed between January 2017 and February 2020 were reviewed. The primary endpoint was the diagnostic success. Secondary endpoints were technical success, total procedure duration, number of CT acquisitions and the dose length product (DLP) during step ∆1 (from planning to initial needle placement), step ∆2 (progression to target), and the entire intervention (from planning to final control) and complications. Additional parameters were recorded, such as the lesion’s size and trajectory angles. Sixty patients were included in each group. The lesions median size and median values of the two trajectory angles were significantly lower (20 vs. 29.5 mm, p = 0.006) and higher in the NAV-group (15.5° and 10° vs. 6° and 1°; p < 0.01), respectively. Technical and diagnostic success rates were similar in both groups, respectively 95% and 93.3% in the NAV-group, and 93.3% and 91.6% in the CT-group. There was no significant difference in total procedure duration (p = 0.487) and total number of CT acquisitions (p = 0.066), but the DLP was significantly lower in the NAV-group (p < 0.01). There was no significant difference in complication rate. For PLB, CT-Navigation™ system is efficient and safe as compared to the conventional CT method.

Cone-Beam Computed Tomography as an Adjunct to Performance of Percutaneous Cementoplasty of the Acetabulum

2012 ◽  
Vol 63 (3_suppl) ◽  
pp. S7-S10 ◽  
Author(s):  
Peter L. Munk ◽  
Manraj K. Heran ◽  
David M. Liu ◽  
Hugue A. Ouellette ◽  
Paul W. Clarkson
Keyword(s):  
Computed Tomography ◽  
Morbid Obesity ◽  
Radiofrequency Ablation ◽  
Breast Carcinoma ◽  
Metastatic Disease ◽  
Cone Beam Computed Tomography ◽  
Cone Beam ◽  
Fluoroscopic Guidance ◽  
Body Habitus ◽  
Percutaneous Cementoplasty

Acetabuloplasty is a valuable palliative adjunct for the treatment of patients with painful metastatic disease to the pelvis in selected cases. We report the case of a 45-year-old woman with morbid obesity and with breast carcinoma who was technically difficult to treat under fluoroscopic guidance due to very poor visualization secondary to her body habitus. It was possible to perform radiofrequency ablation and acetabuloplasty with the use of cone-beam computed tomography for guidance.

C-Arm Cone Beam Computed Tomography Guidance for Radiofrequency Ablation in Hepatocellular Carcinoma

Oncology ◽  
2017 ◽  
Vol 92 (3) ◽  
pp. 142-152 ◽  
Author(s):  
Keizo Kato ◽  
Hiroshi Abe ◽  
Makiko Ika ◽  
Takeshi Yonezawa ◽  
Yoshiyuki Sato ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Hepatocellular Carcinoma ◽  
Radiofrequency Ablation ◽  
Cone Beam Computed Tomography ◽  
Cone Beam ◽  
Computed Tomography Guidance

scholarly journals Estimating the Entrance Surface Dose in the Eyes, Thyroid, and Parotid Gland Regions in Adult and Pediatric Groups: A Cone-Beam Computed Tomography Technique

2021 ◽  
Author(s):  
Reza Omidi ◽  
Fariba Farhadi Birgani ◽  
Ali Asghar Parach ◽  
Hamed Zamani ◽  
Saman Dalvand ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Parotid Gland ◽  
Cone Beam Computed Tomography ◽  
Pediatric Patients ◽  
Age Groups ◽  
Cone Beam ◽  
Surface Dose ◽  
Parotid Glands ◽  
Entrance Surface Dose ◽  
Significant Difference

Purpose: This study aimed to determine the Entrance Surface Dose (ESD) of sensitive organs in Cone-Beam Computed Tomography (CBCT) imaging of the maxillofacial region in the two age groups of adult and pediatric. Materials and Methods: In this work, the measurements were performed using Thermo Luminescent Dosimeters (TLD-GR200). The imaging was performed using a PROMAX 3D CBCT scanner for 30 adults and 20 pediatric patients. The ESD value for each patient in the region of eyes, thyroid, and parotid glands was measured by 15 TLDs during CBCT of maxillofacial. Results: The highest and lowest mean values of ESDs were related to the parotid and thyroid gland regions in adults, 4.77 ± 0.61 mGy and 0.37 ± 0.16 mGy, respectively. In addition, these values were obtained 2.97 ± 0.36 mGy and 0.35 ± 0.12 mGy in pediatric groups as the highest and lowest values in that order. The results showed that the ESD values of the parotid gland regions in maxilla and mandible examinations had a significant difference (P <0.05). In addition, there was a significant difference between the ESD values of the parotid gland regions among the adults and pediatric groups (P <0.05). Conclusion: According to the results, the ESD values in both age groups were higher in the parotid gland region during maxillofacial CBCT examinations. Therefore, it is recommended to set radiation parameters like mAs as low as possible for reducing the patient dose, especially pediatric patients due to the more sensitive organs.

scholarly journals Is radiofrequency ablation safe and effective in treating osteoid osteomas? A prospective single-center study with atypical cases

2020 ◽  
Vol 28 (3) ◽  
pp. 230949902096055
Author(s):  
Gokhan Yuce ◽  
Nedim Aytekin ◽  
Serhan Eren ◽  
Birgul Genç ◽  
Ömer Faruk Ateş ◽  
...  
Keyword(s):  
Radiofrequency Ablation ◽  
Osteoid Osteoma ◽  
Rating Scale ◽  
Clinical Success ◽  
Numeric Rating Scale ◽  
Radiology Department ◽  
Surgical Removal ◽  
Single Center ◽  
Technical Success ◽  
Technical Success Rate

Purpose: Osteoid osteomas are benign and nonprogressive lesions. The clinical presentation of osteoid osteoma is typical with night pain responsive to nonsteroidal anti-inflammatory agents. The typical radiological appearance is lucent nidus and adjacent reactive sclerosis. The most traditional management of osteoid osteoma is surgical removal which is associated with significant morbidity. This article aims to demonstrate our single-center experience of 55 patients with osteoid osteoma treated with percutaneous radiofrequency ablation (RFA). Methods: Fifty-five symptomatic patients who were seen at our orthopedics outpatient clinics, diagnosed with osteoid osteoma, and referred to interventional radiology department between May 2015 and April 2019 were enrolled. The nidus size, pain numeric rating scale score, and intramedullary edema diameter before and after RFA were compared. Clinical and technical success, intervention-related complications, and need for subsequent ablation were recorded. Results: Of the 55 patients, including 12 pediatric cases, 6 had atypical locations such as metatarsal, vertebra, and scapula, while 1 case had osteoid osteoma with multiple nidus. The mean age was 18.5 ± 9.6 years. Preintervention maximum nidus diameter, pain score, and edema diameter were significantly lower in postintervention measurements ( p < 0.001). Technical success rate was 98.1%, and clinical success was 96.36%. Severe complication occurred in one patient with soft tissue burn and osteomyelitis. Conclusion: This is one of the largest series of osteoid osteoma treated with RFA done in a single center with atypical cases. In conclusion, RFA is safe and effective in both pediatric and adult patients with rare complications even in challenging cases with atypical locations.

Marker-less assessment of the geometric error of fused cone-beam computed tomography images of the foot constructed using stitching software

2020 ◽  
pp. 028418512096395
Author(s):  
Ruud HH Wellenberg ◽  
Johannes GG Dobbe ◽  
Jukka Erkkilä ◽  
Mario Maas ◽  
Geert J Streekstra
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Lower Leg ◽  
Geometric Error ◽  
Cone Beam ◽  
Validation Method ◽  
First Metatarsal ◽  
Computed Tomography Images ◽  
Conventional Ct ◽  
Translation Errors

Background Image noise, object repositioning, initial manual image alignment, and stitching of different volumes, i.e. anatomical regions may all affect the stitching error of fused cone-beam computed tomography (CBCT) images. Purpose To determine the geometric error of fused CBCT images of the hindfoot, lower leg, and forefoot after using stitching software, based on a marker-less validation method. Material and Methods CBCT images of the hindfoot, lower leg, and forefoot were acquired multiple times on a Planmed Verity scanner with and without repositioning the leg between acquisitions. Prototype stitching software was used to stitch hindfoot–forefoot volumes and hindfoot–lower leg volumes. Stitching error was determined via registration and by calculating the displacement of the tibia, first metatarsal, or proximal phalanges, with respect to the calcaneus, compared to their position on conventional CT. Results Overall total translation and rotation errors were 1.22 ± 0.62 mm (range 0.43–3.07 mm) and 1.27° ± 0.53° (range 0.29°–2.88°). Lower leg translation was smaller compared to forefoot translation ( P < 0.001). No statistical difference was observed between lower leg and forefoot rotation errors ( P = 0.186). Cadaver repositioning between acquisitions resulted in larger rotation errors ( P < 0.05). Cadaver repositioning did not affect translation errors ( P = 0.768). Conclusion Geometric error of fused CBCT images can be quantified using a marker-less validation method. Stitching of hindfoot volumes with forefoot and lower leg volumes induces translation and rotation errors of up to approximately 3 mm and 3°. Translation errors are larger in hindfoot–forefoot stitches compared to hindfoot–lower leg stitches.

Evaluation of the Dose Index using Cone-Beam Computed Tomography for Pediatric Patients

2018 ◽  
Vol 63 (6) ◽  
pp. 65-70
Author(s):  
А. Лисовская ◽  
A. Lisovskaya ◽  
А. Логинова ◽  
A. Loginova ◽  
К. Галич ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Head And Neck ◽  
Cone Beam Computed Tomography ◽  
Pediatric Patients ◽  
Cone Beam ◽  
Additional Dose ◽  
Scanning Protocol ◽  
Imaging Protocols ◽  
Dose Measurements ◽  
Dose Index

Purpose: Cone-beam computed tomography (CBCT) is an indispensable procedure for accurate patient positioning during radiation therapy (RT) in many clinical cases. However, the patients get an additional dose using CBCT. This dose is neither therapeutic nor diagnostic. It is very difficult to obtain the reliable information about the dose distribution within the patient using the CBCT. Despite this, there is a need to control the additional dose for the pediatric patients and reduce it. There are different approaches of imaging dose evaluation. Most accurate methods are based on the Monte-Carlo calculation and thermoluminescent dosimeters-based measurements. However, the implementation of these methods is complex and cumbersome, that makes impossible their application in routine clinical practice. The evaluation of dose indexes is an accessible and convenient alternative. The purpose of this study is evaluation of the cone beam computed tomography dose indexes for different imaging protocols and object sizes. Material and methods: The technique based on absolute and relative dose measurements for CBCT was used in this study. Absolute dose measurements were performed at the periphery and center of the FREEPOINT (CIRS) phantom using the Farmer type chamber FC65-P for each CBCT protocols. FREEPOINT (20 cm height, 30 cm width, 30 cm length) was used for imitation big chest and pelvis. Inner insert (16 cm diameter) of the phantom was used for imitation head, small chest and pelvis. The dose profiles were measured using I’mRT MatriXX (IBA) and analyzed by OmniPro-I’mRT software, dose indexes DLP (dose–length product) were calculated. Results: The dose indexes were identified for five protocols corresponding three scanning areas (Head and Neck, Chest and Pelvis). The dose indexes were 51.82 and 90.25 mGy×cm using Head and Neck S20 and Head and Neck M20 protocols respectively. The lowest dose index was obtained 13.28 mGy×cm for Fast Head and Neck S20. It was established that the scanning object size strongly affects on the dose index values and, as result, on the absorbed dose within the patient. The dose indexes were 305.42 and 187.53 mGy×cm using scanning protocol Chest M20 for small and big phantoms respectively. The similar results were obtained for scanning protocol Pelvis M15. The highest dose index was obtained 846.93 mGy×cm for the small phantom, while the dose index was 563.79 mGy×cm for the big phantom. The necessity of several clinical protocols to scan different areas was shown. Using of the Pelvis M15 protocol for head scanning may increase the additional point dose 96 times in comparison with Fast Head and Neck S20 protocol. Conclusion: The dose indexes were evaluated taking into account the size of the scanning object for different imaging protocols. Routine use of CBCT in clinical practice requires a sensible choice of the scanning protocol based on the results of the dose index estimation.

scholarly journals Radiofrequency ablation guided by cone beam computed tomography for hepatocellular carcinoma: a comparative study of clinical results with the conventional spiral computed tomography-guided procedure

2019 ◽  
Vol 47 (8) ◽  
pp. 3699-3708
Author(s):  
Tianshi Lyu ◽  
Jian Wang ◽  
Shoujin Cao ◽  
Li Song ◽  
Xiaoqiang Tong ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Hepatocellular Carcinoma ◽  
Radiofrequency Ablation ◽  
Cone Beam Computed Tomography ◽  
Objective Response ◽  
Operation Time ◽  
Spiral Computed Tomography ◽  
Cone Beam ◽  
Spiral Computed ◽  
Ct Guided

Objective To compare the outcomes of cone beam computed tomography (CBCT)-guided radiofrequency ablation (RFA) for hepatocellular carcinoma (HCC) with those of traditional spiral computed tomography (s-CT)-guided RFA. Methods This retrospective study analysed data from patients with HCC that underwent RFA guided by either CBCT or s-CT. A number of preoperative and postoperative characteristics, including operation time, ablation time, radiation dose and hospital stay were recorded for all patients. The incidence of intraoperative and postoperative complications was recorded. The therapeutic effect was evaluated at 1, 3 and 6 months after RFA. Results A total of 47 patients with HCC (12 females and 35 males) underwent successful RFA: 21 underwent CBCT-guided RFA and 26 underwent s-CT-guided RFA. Except for one case of pneumothorax in the s-CT group, no serious complications occurred. The objective response rate and disease control rate at 1, 3 and 6 months after RFA showed no significant differences between the two groups. Throughout the 6-month follow-up period, the complete ablation rate was 19 of 21 patients (90.5%) in the CBCT group and 19 of 26 patients (73.1%) in the s-CT group. Conclusions CBCT was a safe and effective guiding modality for RFA in patients with HCC.

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