Ronald Booij

• Doctor of Philosophy
• PhD at Erasmus MC

Background We compared photon-counting detector computed tomography (PCD-CT) polyenergetic images, PCD-CT virtual monoenergetic images (VMI), and energy-integrating detector computed tomography (EID-CT) polyenergetic images regarding bone visualization and metal artifacts in patients with titanium wrist prostheses. Methods After ethical approval,...

Purpose To assess the image quality of the bone-implant interface of acetabular cup implants using photon-counting detector (PCD) CT with and without tin pre-filtration in a clinical setting. Methods and materials Twenty-four patients underwent PCD-CT imaging of their total hip replacement (THR). Twelve patients were scanned using 140 kVp and twel...

Background Dorsal preservation is a recently popularized technique to lower the nasal dorsum without opening the cartilaginous vault. Improved nasal breathing has been reported after lowering an intact dorsum using preservation techniques, suggesting that septal deprojection opens the internal nasal valves. The goal of this study was to evaluate th...

Recent advancements in computed tomography (CT) technology have introduced a revolutionary innovation to practice known as the Photon-Counting detector (PCD) CT imaging. The pivotal hardware enhancement of the PCD-CT scanner lies in its detectors, which consist of smaller pixels than standard detectors and allow direct conversion of individual x-ra...

Background The aim of our current systematic dynamic phantom study was first, to optimize reconstruction parameters of coronary CTA (CCTA) acquired on photon counting CT (PCCT) for coronary artery calcium (CAC) scoring, and second, to assess the feasibility of calculating CAC scores from CCTA, in comparison to reference calcium scoring CT (CSCT) sc...

In musculoskeletal imaging, CT is used in a wide range of indications, either alone or in a synergistic approach with MRI. While MRI is the preferred modality for the assessment of soft tissues and bone marrow, CT excels in the imaging of high-contrast structures, such as mineralized tissue. Additionally, the introduction of dual-energy CT in clini...

Background Photon‐counting CT (PCCT) is the next‐generation CT scanner that enables improved spatial resolution and spectral imaging. For full spectral processing, higher tube voltages compared to conventional CT are necessary to achieve the required spectral separation. This generated interest in the potential influence of thin slice high tube vol...

Objectives To compare coronary artery calcification (CAC) scores measured on virtual non-contrast (VNC) and virtual non-iodine (VNI) reconstructions computed from coronary computed tomography angiography (CCTA) using photon-counting computed tomography (PCCT) to true non-contrast (TNC) images. Methods We included 88 patients (mean age = 59 years ±...

Abstract Background Successful osseointegration of joint replacement implants is required for long-term implant survival. Accurate assessment of osseointegration could enable clinical discrimination of failed implants from other sources of pain avoiding unnecessary surgeries. Photon-counting detector computed tomography (PCD-CT) provides improvemen...

Photon-counting computed tomography (PCCT) is a new technology that enables higher spatial resolution compared to conventional CT techniques, energy resolved imaging and spectral post-processing. This leads to improved contrast-to-noise ratio, artifact and potential dose reduction as well as elimination of electronic noise. Since the introduction o...

Purpose: To systematically assess the radiation dose reduction potential of coronary artery calcium (CAC) assessments with photon-counting computed tomography (PCCT) by changing the tube potential for different patient sizes with a dynamic phantom. Methods: A hollow artery, containing three calcifications of different densities, was translated a...

Purpose To quantitatively and qualitatively assess the visibility of bone structures in the wrist on photon-counting detector computed tomography (PCD-CT) images compared to state-of-the-art energy-integrating detector CT (EID-CT). Method Four human cadaveric wrist specimens were scanned with EID-CT and PCD-CT at identical CTDIvol of 12.2 mGy and...

Imaging plays a pivotal role in the noninvasive assessment of cystic fibrosis (CF)-related lung damage, which remains the main cause of morbidity and mortality in children with CF. The development of new imaging techniques has significantly changed clinical practice, and advances in therapies have posed diagnostic and monitoring challenges. The aut...

To evaluate whether the contrast-to-noise ratio (CNR) of an iodinated contrast agent in virtual monoenergetic images (VMI) from the first clinical photon-counting detector (PCD) CT scanner is superior to VMI CNR from a dual-source dual-energy CT scanner with energy-integrating detectors (EID), two anthropomorphic phantoms in three different sizes (...

Objectives The aim of this study was to determine mono-energetic (monoE) level–specific photon-counting CT (PCCT) Agatston thresholds, to yield monoE level independent Agatston scores validated with a dynamic cardiac phantom. Also, we examined the potential of dose reduction for PCCT coronary artery calcium (CAC) studies, when reconstructed at low...

To systematically compare coronary artery calcium (CAC) quantification between conventional computed tomography (CT) and photon-counting CT (PCCT) at different virtual monoenergetic (monoE) levels for different heart rates. A dynamic (heart rates of 0, < 60, 60–75, and > 75 bpm) anthropomorphic phantom with three calcification densities was scanned...

In order to assess coronary artery calcium (CAC) quantification reproducibility for photon-counting computed tomography (PCCT) at reduced tube potential, an anthropomorphic thorax phantom with low-, medium-, and high-density CAC inserts was scanned with PCCT (NAEOTOM Alpha, Siemens Healthineers) at two heart rates: 0 and 60–75 beats per minute (bpm...

Objective: To assess the influence of breathing state on the accuracy of a 3D camera for body contour detection and patient positioning in thoracic CT. Materials and methods: Patients who underwent CT of the thorax with both an inspiratory and expiratory scan were prospectively included for analysis of differences in the ideal table height at di...

Objectives The purpose of this study was twofold. First, the influence of a novel calcium-aware (Ca-aware) computed tomography (CT) reconstruction technique on coronary artery calcium (CAC) scores surrounded by a variety of tissues was assessed. Second, the performance of the Ca-aware reconstruction technique on moving CAC was evaluated with a dyna...

Inhoud – 1 Inleiding – 2 Voorbereiding voor een CT-onderzoek bij een kind – 3 Scantechniek bij kinderen – 4 Intraveneus contrast – 5 Protocollen – 6 Hoofd, protocollen – 7 Hals en thorax, protocollen – 8 Abdomen, protocollen – 9 CWK – 10 Extremiteiten – 11 Fotogalerij. – Als gevolg van technologische ontwikkelingen is er een toename aan CT-scans bi...

Objective To assess the accuracy of a 3D camera for body contour detection in pediatric patient positioning in CT compared with routine manual positioning by radiographers.Methods and materialsOne hundred and ninety-one patients, with and without fixation aid, which underwent CT of the head, thorax, and/or abdomen on a scanner with manual table hei...

Since the introduction of Computed Tomography (CT), technological improvements have been impressive. The number of adjustable acquisition and reconstruction parameters has increased accordingly. Overall, these developments led to improved image quality at a reduced radiation dose. However, many parameters are interrelated and part of automated algo...

Objective: To assess the dose reduction potential of a calcium-aware reconstruction technique, which aims at tube voltage-independent computed tomography (CT) numbers for calcium. Methods and materials: A cardiothoracic phantom, mimicking three different patient sizes, was scanned with two calcium inserts (named D100 and CCI), containing calcifi...

Objective To assess the accuracy of a 3D camera for body contour detection and patient positioning in CT compared to routine manual positioning by radiographers. Methods and materials Four hundred twenty-three patients that underwent CT of the head, thorax, and/or abdomen on a scanner with manual table height selection and 254 patients on a scanne...

Purpose To show that equal coronary lumen opacification can be achieved with iso- and low-osmolar contrast media when it is injected at the same iodine delivery rate with contemporary cardiac computed tomographic (CT) protocols and to investigate the cardiovascular effect of iso-osmolar contrast media and the image quality achieved. Materials and M...

Objectives The purpose of this study was to assess the efficacy of the renewed dynamic collimator in a third-generation dual source CT (DSCT) scanner and to determine the improvements over the second-generation scanner. Methods Collimator efficacy is defined as the percentage overranging dose in terms of dose–length product (DLP) that is blocked by...

Cardiovascular CT acquisition protocol optimization in pediatric patients, including newborns is often challenging. This might be due to non-cooperative patients, the complexity and variety of diseases and the need for stringent dose minimization. Motion artifacts caused by voluntary and involuntary motion are most frequently seen in cardiac imagin...

PURPOSE/AIM To describe imaging protocols, image reconstruction, post-processing and image analysis methods, and also pitfalls of Dual Energy Computed Tomography (DECT) in paediatric patients with congenital heart disease. CONTENT ORGANIZATION 1.Scan protocol optimization: • patient preparation • imaging parameters • contrast agent injection metho...

Learning objectives In general, Computed Tomography is not the first modality of choice in imaging children. With the introduction of the second-generation Dual Source CT and the Flash technology, even moving children can be examined without the need of sedation. New technologies, like 70 kV and iterative reconstruction, dose has been set to lower...

PURPOSE/AIM To explain the effect of kV adjustments on radiation absorption, patient dose, artifacts and image contrast. To learn how to effectively utilize kV to optimize CT scan protocols in order to improve image quality, use less contrast material or reduce radiation. To provide guidelines how to adapt standard CT protocols to non standard pati...

PURPOSE/AIM To deal with and to benefit from a single reference patient for adult and child protocols To recognize pitfalls in adjusting TCM curves and to learn how to deal with them To provide tips and to learn how to monitor the quality and performance of the new TCM curves CONTENT ORGANIZATION Different TCM techniques What are dose curves and w...

Recently, CT arthrography (CTa) was introduced as a non-destructive technique to quantitatively measure cartilage quality in human knees. This study investigated whether this is also possible using lower radiation dose CT protocols. Furthermore, we studied the ability of (lower radiation) CTa to distinguish between local sulphated glycosaminoglycan...

Background: Hepatocellulair carcinoma (HCC) is the fifth most common cancer and worldwide the third most common cause of death by cancer. Patients with liver cirrhosis have a higher risk for developing hepatocellular carcinoma. Doubling time of these tumors is 3 to 4 months. These patients are usually no candidates for surgery because the liver tis...

PURPOSE/AIM To explain the technical benefits of Dual Source CT in pediatric CT To demonstrate challenging pediatric cases of cardiac and extracardiac anomalies achieved at low contrast and radiation dose To learn how to assess various cardiac and extracardiac anomalies CONTENT ORGANIZATION Introduction Technical scanner features Bowtie filter Do...

PURPOSE/AIM To learn how to utilize new innovative scanner technologies to optimize image protocols at the lowest dose, without compromising image quality To understand the need of well educated and trained personnel for optimal use of new CT innovations To learn methods how to deal with the rapid and large changes in technical fields and workflow...

Similar to delayed gadolinium enhanced MRI of cartilage, it might be possible to image cartilage quality using CT arthrography (CTa). This study assessed the potential of CTa as a clinically applicable tool to evaluate cartilage quality in terms of sulphated glycosaminoglycan content (sGAG) and structural composition of the extra-cellular matrix (E...

PURPOSE/AIM 1. To be able to interpret standardized terminology used in CT regarding radiation dose 2. To understand how to estimate effective radiation dose and risk in adults and pediatrics in a clinical setting. 3. To provide an extensive overview on how the choice of technique and parameters affect radiation dose in CT CONTENT ORGANIZATION Ho...

PURPOSE/AIM 1. To learn how to utilize and optimize contrast in everyday CT exams from CTA to virtual colonoscopy 2. To understand change in intravenous contrast material bolus characteristics with different injection techniques 3. To demonstrate ways to standardize protocols in respect to intravenous contrast material administration. CONTENT ORG...

PURPOSE/AIM 1. To understand criteria that define CT image quality like resolution and noise 2. To describe the technical features of CT and demonstrate the effect on image quality 3. To learn optimal methods to manipulate scan parameters in order obtain good image quality CONTENT ORGANIZATION How do I determine the image quality and what do I ne...

PURPOSE/AIM To discuss the added value of second generation Dual Source CT on pediatric patients To demonstrate the effect on radiation dose and contrast material administration compared to former scanner models in our institution To demonstrate image quality with ultra fast Flash CT without the use of anesthesia CONTENT ORGANIZATION A. Introducti...

The amount of atherosclerotic plaque and its components (calcifications, fibrous tissue, and lipid core) could be better predictors of acute events than the now currently used degree of stenosis. Therefore, we evaluated a dedicated software tool for volume measurements of atherosclerotic carotid plaque and its components in multidetector computed t...

LEARNING OBJECTIVES 1. Describe the technical features of an automated tube current modulation technique in multislice CT. 2. Demonstrate a simple way to evaluate the working of automated tube current modulation in a practical setting. 3. Demonstrate potential pitfalls and provide tips and guidelines for scan protocol optimization. ABSTRACT The in...

PURPOSE/AIM • To learn how to benefit from MPR and 3D imaging in trauma imaging of the head and neck • To recognize pitfalls and to learn how to deal with them • Demonstrate how to create fast and robust scan- and post-processing protocols CONTENT ORGANIZATION Introduction What is MPR and 3D imaging? Dataset requirements Kernel Slice thickness Inc...

PURPOSE/AIM To present insight on the basic principles of DECT and provide a pictorial review of the range of morphology of lung perfusion with diagnostic clues differentiating acute pulmonary embolism (APE) from other underlying diseases. CONTENT ORGANIZATION Typically, APE presents on a DECT perfusion map as a peripheral, wedge shaped defect. Ho...