The diagnostic value of open 1 Tesla MRI compared to closed 1.5 T scanners

Literature review · Updated: May 2026 · APERTA Diagnostic Centre, Rzeszów

1. Introduction and clinical context

Traditional MRI scanners operating at 1.5 T and 3 T have a closed tunnel design (gantry diameter ~60 cm), which causes significant difficulties in performing the scan for some patients. It is estimated that 4–30% of patients experience significant claustrophobic discomfort during MRI, and 1–15% interrupt the scan or withdraw from it entirely1^,2. The situation is particularly critical in children, where the proportion of incomplete scans without sedation may exceed 30% in patients under 7 years of age³.

Open MRI scanners, historically operating at low field strengths (0.2–0.6 T), provided comfort but their diagnostic value was limited. The current generation of open 1 T high-field systems (including the Philips Panorama 1.0T HFO) is changing this paradigm – they combine the comfort of an open design with imaging quality comparable to that of 1.5 T closed systems for most clinical indications.

2. Technical characteristics of 1T HFO vs 1.5T closed systems

The lower B₀ value is partially compensated for by modern coils, optimised sequences (e.g. SENSE, mDIXON) and longer acquisition times. In clinical practice, diagnostic quality is comparable for most routine^4,5 examinations.

3. Diagnostic value in selected clinical areas

3.1 Musculoskeletal system

Comparative studies of 1T HFO versus 1.5T closed-bore MRI of the knee, shoulder and spine showed no statistically significant differences in the detection of meniscal tears, anterior cruciate ligament (ACL) tears, rotator cuff tears and disc^4,6 pathologies. The sensitivity of 1T for major knee pathologies ranged from 88% to 95%, similar to that of 1.5T (90%–97%).

“High-field open MRI at 1.0 T provides diagnostic image quality comparable to 1.5 T closed-bore systems for the majority of routine musculoskeletal indications, with the added benefit of patient comfort and accessibility for claustrophobic, paediatric and bariatric populations.” (paraphrase of meta-analysis⁴ results)

3.2 Neuroimaging

For routine brain examinations (diagnosis of strokes, epilepsy, multiple sclerosis, tumours), 1T HFO offers sufficient anatomical resolution and contrast for the vast majority of clinical⁷ questions. Limitations arise in highly demanding functional (fMRI), diffusion studies with high b-values (>2000 s/mm²) or high-resolution spectroscopy – in these cases, 1.5 T or 3 T should be preferred.

3.3 Paediatrics

In children, 1T HFO offers a significant clinical advantage – the presence of a parent, an open space and lower noise levels (in some models) result in a reduction in the proportion of examinations requiring general sedation. In one prospective study, the proportion of children aged 4–7 years who completed the scan without sedation increased from 38% (1.5 T closed) to 79% (open)³.

The clinical and economic implications are significant: a reduction in sedation means a reduction in anaesthetic risk, shorter hospital stays and lower costs.

3.4 Claustrophobic patients

The success rate of completing the scan in patients with claustrophobia is 96–100% in open scanners, compared with 60–85% in closed^2,8 scanners. This eliminates the need for benzodiazepine premedication and the associated risks.

3.5 Larger patients / strength athletes

Closed scanners have physical limitations regarding body size (gantry ~60 cm, table weight limit 130–150 kg). Open 1T systems eliminate these limitations, enabling the diagnosis of orthopaedic patients with a bodybuilder’s physique, class II–III obesity or broad shoulders – a population for whom there is often no diagnostic alternative in MRI of comparable quality⁹.

4. Limitations of 1T HFO

Despite numerous advantages, one should be aware of the limitations:

• Lower SNR requires longer acquisition times for comparable resolution
• Reduced availability of advanced techniques (high-resolution DTI, 2D/3D spectroscopy, high-temporal-resolution fMRI)
• Uncertainty in the diagnosis of micropathology (e.g. cerebral microangiopathy, micrometastases <5 mm)
• Limited value in certain areas: perfusion cardiac MRI, high-resolution breast MRI – for these indications, 1.5 T or 3 T remains the preferred choice

5. Practical recommendations for referring doctors

Recommend open 1T HFO in the following cases:

1. Patients with documented claustrophobia or a history of examination interruption in the tunnel
2. Paediatric patients – particularly at an age where sedation would normally be required (3–7 years)
3. Elderly patients with difficulty lying flat, dementia or disorientation
4. Patients with an atypical body build (bodybuilders, obesity grades II–III, broad chest)
5. Routine indications: musculoskeletal, neurological (excluding fMRI), abdominal MRI

Prefer 1.5 T or 3 T closed-bore in the following cases:

• Functional MRI (fMRI BOLD)
• High-resolution magnetic resonance spectroscopy
• Micropathology diagnosis (microangiopathy, micrometastases <5 mm)
• Cardiac MRI with high-resolution perfusion
• Breast MRI using the BI-RADS protocol

6. Collaboration with APERTA

The APERTA Centre (Rzeszów) offers Poland’s first high-field 1T open MRI (Philips). We collaborate with referring doctors from across the country, offering:

• Prompt appointments (24–48 hours for patients from your practice)
• A full medical report from a specialist radiologist (email within 24–48 hours)
• A dedicated communication channel with our team (doctor on call by telephone)
• Consultation support for unusual indications