Handheld, Portable or Trolley Ultrasound: How to Choose
"Handheld, portable or trolley - which is better?" is a question that leads people in the wrong direction, because it assumes the three have advantages and disadvantages against each other. In practice they are three different places to use a machine: a trolley stays in one room; a portable unit goes where the operator goes but needs somewhere to be put down; a handheld system has the whole machine in the handle, so when the probe is picked up the machine is already in hand. Settle the place, and the configuration follows.
1. Answer three questions first
- Will this machine mostly stay in one room, or follow the operator around? In a fixed consulting room, a larger screen saves effort. Going upstairs, into wards or out to a village, weight and start-up time affect whether you will actually use it far more than screen size does.
- During an examination, can the operator free a second hand to work the main unit? When parameters have to be changed while scanning, a main unit out of reach breaks the movement up; a screen right beside you - or no separate main unit at all - keeps it continuous.
- Is an archived record needed straight after the examination? Issuing a report on the spot and connecting a printer needs a built-in workstation; if the images are only looked at and stored for tidying up back in the office, a handheld device is enough.
2. The three forms side by side
Every figure in the table below is copied item by item from the published technical data for the corresponding models on this site, without conversion or combination.
| Dimension | Handheld (probe is the system) | Portable | Trolley |
|---|---|---|---|
| Where the main unit is | Inside the probe handle | Inside the housing | Inside the trolley body |
| Display | Image received on a phone, tablet or Windows computer | Built-in screen (15-inch or larger) | Built-in screen (15-inch / 21.5-inch) |
| Weight, as quoted | Probe 120 g / 230 g / 300 g depending on model | Main unit 7.5 kg / 8.4 kg, probe excluded | Net weight of the whole system about 20 kg |
| Power | Probe battery for 1-3 hours depending on model; charging about 2-3 hours | Built-in battery, continuous scanning for 1.5 hours or more / 2 hours or more depending on model | Mainly mains power; some models have a built-in battery |
| Probe configuration | Single-head, dual-head or three-in-one; changing the probe means changing the whole probe | Two or more probe connectors | Four probe connectors (C200); the C100T is mainly used with wireless probes |
| Depth capability | By probe, from 20 / 30 / 40 / 55 mm up to 90 / 160 / 220 / 305 mm | Maximum display depth 320 mm or more / 350 mm or more depending on model | Scanning depth 30 cm or more |
| Time to be ready | Take out the probe, connect, and use | Unpack, position, power up | Push to the bedside, plug in or rely on the battery |
| Image archiving | Stored on the phone or tablet, exportable | Stored on the machine (5000 frames or more in B mode) and exportable | Built-in reporting workstation, printer can be connected |
3. Where the differences actually lie
1. Whose screen it is. A handheld device has no separate display - the image appears on a phone or tablet. The advantage is that you choose the screen size; the drawback is that the phone occupies one hand during the examination. Portable and trolley systems have their own medical display, so the image stays on the machine and is not interrupted by calls or notifications.
2. The weight differs by an order of magnitude. Handheld probes weigh 120 g, 230 g and 300 g depending on model (5PA is 120 g, 5LP is 230 g, 5T is 300 g), so they can be held in one hand for a long time. Portable main units are 7.5 kg (C10) and 8.4 kg (C10B) - that is "can be lifted", not "can be carried on your back". A trolley system weighs about 20 kg net and is moved on its wheels.
3. The power logic is different. On a handheld device the battery is inside the probe: the 5 series common data gives about 3 hours of uninterrupted scanning, with individual models differing (about 1 hour for 5PA, about 2.5 hours for 5T), and wireless or cable charging takes about 2-3 hours. Portable units have a built-in battery, giving 1.5 hours or more (C10B) up to 2 hours or more (C10) of continuous scanning. Trolley systems run mainly on mains power, with an optional built-in battery on some models. For work away from a socket, work backwards from "how long will it be used, and can it be charged in between" to how many batteries are needed.
4. How the probe is changed. On a handheld system, changing the probe means changing the whole probe unit - a three-in-one configuration switches between convex, linear and cardiac modes in software, which removes that step entirely. Portable and trolley systems use plug-in connectors: the more connectors, the more probes can be connected at once, which cuts the time spent swapping heads.
5. Be clear about what the depth figure means. On a handheld device the depth depends on the probe fitted: high-frequency linear 20 / 30 / 40 / 55 mm in four steps, convex 90 / 160 / 220 / 305 mm, cardiac mode 90 / 120 / 140 / 160 mm. Portable systems quote the maximum display depth of the whole machine - 350 mm or more for the C10, 320 mm or more for the C10B. Trolley systems quote a scanning depth of 30 cm or more. These are system limits, not something every probe can reach.
4. What each one cannot do
Setting out the limits is more useful than setting out the advantages.
| Form | What it cannot do | How that is handled in practice |
|---|---|---|
| Handheld | No separate display and no built-in reporting system; mirroring to several screens works over Wi-Fi Direct on Android devices only, and is not currently supported on Apple devices | Store images on the device and export them to a computer to organise; add a workstation where reports are needed |
| Portable | Main unit 7.5 kg / 8.4 kg, inconvenient over long distances; 1.5 hours or more / 2 hours or more of runtime, so continuous work needs spare power | Keep it in a department or consulting room; for work away, use a vehicle supply or a spare battery |
| Trolley | About 20 kg, awkward up and down stairs or between floors; depends on mains power or the optional battery | Keep it in a fixed examination room; where bedside work is needed, use a handheld or portable system instead |
5. Choosing by where it will be used
| Where it will be used | Suggested form | Why |
|---|---|---|
| Everyday outpatients at a village clinic or community health station | Handheld (dual-head or three-in-one) | Little space and several rooms; one device has to cover abdomen and superficial work |
| Ultrasound room at a township health centre | Portable (two or more connectors) | A fixed couch and desk are available, and reports and a printer are needed |
| Hospital ultrasound department, health screening centre | Trolley (multiple connectors) | High patient volume, frequent probe changes, workstation and printer close at hand |
| Wards and ICU bedside | Handheld or portable | It has to be taken to the bedside; the lighter it is, the more likely it is to be used |
| Outreach clinics, village visits, pre-hospital | Handheld (not dependent on the venue's Wi-Fi) | No network and no reliable mains power on site; the device has to form its own network and supply its own power |
Where one device has to cover both outpatient work and village visits, the usual arrangement is a handheld system as the main unit with a portable one added as needed. Doing it the other way round - buying a trolley first and then taking it to a village - more often ends with it standing unused because it cannot be moved.
6. Three common misjudgements
- Looking only at screen size and ignoring who is holding it. A larger screen is genuinely more comfortable to read, but if one hand is steadying the patient and the other is holding the probe, a main unit out of reach interrupts the movement instead of helping.
- Buying the unit with the highest specification rather than the one that will be used. The upper limits in a specification table only matter if the sites you examine actually reach them. Where abdomen and superficial work dominate, a 305 mm depth capability goes unused, while the resolution of a high-frequency linear probe affects everyday work far more.
- Ignoring consumables and accessories. On a handheld system the probe is the whole device, so a knock means replacing the whole thing; on portable and trolley systems the probe is a replaceable part. This difference tends to be passed over at purchase and becomes obvious three years later.
7. Common questions
Q: Can a handheld device produce a report directly?
A: The handheld models do not include a reporting workstation. Images are shown on a phone, tablet or Windows computer and can be stored and then exported to organise. To issue a report on the spot, a workstation has to be added, or a trolley model with a built-in workstation used instead.
Q: A portable unit weighs 7.5 kg - can one person carry it through an outpatient building?
A: Over short distances, yes; over long distances or up and down stairs repeatedly, it is not advisable. The portable form assumes there is a fixed place to put it. Where it genuinely has to be carried around, the handheld form suits better.
Q: Can a trolley system be pushed to a ward for bedside use?
A: It can be pushed, but at about 20 kg net it is limited between floors and in narrow corridors, and it needs mains power or the optional battery. For bedside work a handheld or portable system is usually less trouble; the trolley suits a fixed examination room.
Q: A three-in-one probe, or three separate single-head probes?
A: A three-in-one builds convex, linear and cardiac transducers into one probe and switches between them in software, which saves both the probe changes and the cost of carrying several. Three separate single-head probes are more specialised within their own frequency range. Where the case mix is wide and one device has to cover several sites, the three-in-one is less trouble; where the work is only superficial, or only abdominal, a single head is enough.
Related reading
- Handheld ultrasound
- Portable ultrasound
- Trolley ultrasound
- Downloads: ultrasound probe selection table
The figures in this article are taken from the technical documentation for the corresponding models on this site. The actual configuration and scope of application are the ones stated in the product registration certificate. For contraindications and precautions, refer to the instructions for use. The device must be operated by a licensed physician with the relevant qualifications.
