Certainly! Here are some of the leading manufacturers in each category of hospital equipment:

COVID-19 Test Kits:

1. Roche Diagnostics
2. Abbott Laboratories
3. Thermo Fisher Scientific
4. Qiagen
5. Becton Dickinson and Company

Ventilators and Respirators:

1. Philips Healthcare
2. Medtronic
3. Dräger
4. GE Healthcare
5. Siemens Healthineers

ICU Equipment:

1. Hillrom
2. Getinge
3. Stryker
4. Smiths Medical
5. Draeger

Magnetic Resonance Imaging and Ultra-Sonic Scanning Equipment:

1. GE Healthcare
2. Siemens Healthineers
3. Philips Healthcare
4. Hitachi Healthcare
5. Canon Medical Systems

X-Ray Equipment:

1. GE Healthcare
2. Siemens Healthineers
3. Philips Healthcare
4. Fujifilm Medical Systems
5. Carestream Health

Cancer Treatment:

1. Varian Medical Systems
2. Elekta
3. Accuray
4. Siemens Healthineers
5. ViewRay

Hospital Infrastructure:

1. Hill-Rom Holdings
2. STERIS
3. Skytron
4. TRUMPF Medical 5 Getinge

Emergency Aid (Equipment and Services):

1. Stryker
2. ZOLL Medical Corporation
3. Physio-Control (a Stryker Company)
4. Ferno
5. Bound Tree Medical

Monitoring and Electro-diagnostic Equipment:

1. Philips Healthcare
2. GE Healthcare
3. Nihon Kohden4. Schiller
4. Masimo

Computerized Tomography Equipment:

1. GE Healthcare
2. Siemens Healthineers
3. Philips Healthcare
4. Canon Medical Systems
5. Hitachi Healthcare

ICT (E-medicine, Equipment, and Related Software):

1. Cerner Corporation
2. Epic Systems Corporation
3. Allscripts Healthcare Solutions
4. IBM Watson Health
5. Siemens Healthineers

These are some of the major manufacturers in each category, though there are several other reputable companies in the market as well.